A tunnel kiln for ceramic products

Abstract

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).

Description

technical field [0001] The invention relates to a tunnel kiln for ceramic products. [0002] In particular, the invention relates to tunnel kilns with roller conveyors on which ceramic products, such as ceramic tiles, are located. Background technique [0003] It is known to heat a tunnel kiln with two series of burners, one on each side of said tunnel, usually working with methane gas, the two series of burners being arranged on the side walls of the tunnel and towards the opposite tunnel wall. [0004] It is preferred to have two rows of burners on each side of the tunnel, one above and one below the roller conveyor. [0005] Groups of burners arranged in branches are supplied through separate gas pipes and to each group of burners via taps controlled by a temperature control system. [0006] The firing cycle of the tiles is determined very precisely by means of a firing map that provides for gradual heating of the tiles starting from the kiln inlet, holding the tiles a...

AI Technical Summary

Problems solved by technology

[0014] Unfortunately, measurements from thermocouples located on the side walls are often affected by the presence of turbulence along said walls and the tight placement between the burners themselves

This means that the measurement of the temperature value is actually accurate with respect to the exact point at which the measurement was made, but deviates significantly with respect to the temperature at the tile immediately adjacent to the roller

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