(57) A tunnel kiln (1) for ceramic products comprising two opposite lateral walls (2),
a horizontal roller conveyor (5) destined to support and advance a layer of tiles
(100) internally of the kiln (1), a first series of burners (51) and a second series
of burners (52) arranged aligned along the two lateral walls and facing towards the
opposite wall, each burner (51) of the first series (51) being provided exclusively
with an axial flame such as to heat a central zone of the tunnel while each burner
(52) of the second series is provided with at least a radial-flame nozzle such as
to beat a zone which is proximal to the lateral wall of the tunnel, each burner (51,
52) of the first and the second series being connected to a common conduit (60) of
combustible gas and respectively to a first (510) and a second (520) conduit of a
comburent, comprising: means (523) for detecting a dimensional out-of-size with respect
to a design project specification for the products exiting the kiln (1); a control
unit (522) for receiving data coming from the means (523) for detecting; means for
regulating (521) a flow rate of the comburent to the burners (52) of the second series
on the second conduit (520) of the comburent, the means for regulating (521) of the
comburent flow rate being controlled by the control unit (522) which is programmed
to command the means for regulating (521) according to the data received from the
means for detecting (523).
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