DE2705783A1 - Tunnel kiln with zigzag side walls - which provide uniform heating of stacks of workpieces even in wide kilns - Google Patents

Abstract

Directly fired tunnel kiln heated with solid fuel stand using one or more tunnels arranged side by side. Both side walls inside each tunnel have a zig-zag shaped aligned w.r.t. each side so the free cross-section between the charge and the tunnel wall is constant; and firing grates are located in the recesses formed by the zig-zag walls. Channels in the roof are pref. used to feed fuel into the recesses; and similar channels are pref. provided in the hearth to remove ash. The stacks of workpieces are pref. located at a slight angle w.r.t. the transverse direction of the tunnel to facilitate the circulation of the heating gases. The direction of the heating gases flowing through the tunnel may be periodically reversed for short periods. The kiln can be fired with wool or coal without forming ash on the workpiece or the kiln-cars carrying the workpieces. Good heat transfer is achieved to continuously moving kiln-cars even using wide tunnels.

Description

BY REGISTERED MAIL

"Directly fired tunnel kiln for firing ceramic products" Tunnel ovens for ceramic paintings are generally used with direct firing fired with gas or oil.

The direct firing with solid fuel took place from above between the stock or via grate furnaces arranged on the side. For this purpose were Fire niches arranged in the inner lining of the combustion duct. With direct, upper lighting Although wider firing channels are possible, the ash residue is on the material to be burned of great disadvantage.

The lateral lighting, which is suitable in itself, allows only smaller firing channel widths, because with the usual longitudinal flow the heat is not in the required manner in the Central area of the combustion channel can be transferred. The invention has the task based on creating a stove for direct firing with solid fuels such as Wood, coal etc. with no ash in the firing material or on the kiln car coverings remains behind. Furthermore, the furnace should have a gas flow that is flawless Allows heat transfer to the center of the trim even with larger firing channel widths. In order to achieve uniform firing conditions, the furnace should also be continuous Allow kiln carriage advance.

-2- page for patent application nDite> + fired tunnel furnace for Firing of ceramic products ".

According to the invention the object is achieved in that the inner lining of the firing channel is arranged asymmetrically to the firing channel axis on both sides and in principle zigzag-shaped in its longitudinal course.

The flow cross-section arising according to FIG. (1) between the trim and inner lining should remain approximately constant in its sum b1 + b2. Thus stands essentially a large cross-section F1 on the one hand a small cross-section F2 on the other side opposite. The lighting takes place in each of the niches between the facing and the furnace interior lining of the furnace side wall, preferably from above the oven ceiling. Fig. (1) shows an embodiment.

example of the invention, which many configurations Fig. (2) of the oven lining allowed, but the essential feature is always the different, Free flow cross-section between the kiln car set and the furnace lining on the having opposite points of the combustion channel. This will do this lengthways Gas flowing through the furnace with a corresponding setting of the material to be fired essentially Currents running transversely to the axis of the combustion canal offset, which over the fired Lead niches. The heat generated in the niches thus becomes the interior of the interior guided. So that this heat transport to the center of the combustion duct from both sides takes place, it is proposed according to the invention the gas delivery through the combustion channel to be carried out briefly in alternating directions. Fig. (3) shows a cross section from the plan Fig. (1) of the furnace according to the invention.

Another embodiment of the invention is that the material to be fired is placed in stack form so that at an acute angle to the transverse direction of the combustion channel Heating lanes arise between the fuel stacks, which the flow between the is facilitated essentially diagonally opposite heating niches.

It is also provided that in the case of a superdeck structure on the car deck also bottom channels running at an acute angle to the transverse direction of the combustion channel are formed.

Claims (1)

BY REGISTERED LETTER TO A N S P R Ü C H E Claim 1 Directly fired tunnel Stove for heating with solid fuels with one or more side by side arranged combustion channels, which heating niches in the inner lining of the combustion channel side walls have, characterized in that the two inner sides of a focal channel Zig-zag-shaped, are designed asymmetrically to the Brennkanalachsp so that the sum of the two free cross-sections between the facing and the inner lining on opposite sides Points always have the same or approximately the same cross-section and in the Niches of the inner fiitter the grates are arranged. Claim 2 tunnel furnace (1) according to Claim 1, characterized in that that the heating niches (9) from the furnace ceiling by means of fuel feeders (3) to be charged and in the lower part. the same openings for ash removal are available are. "Claims" claim a tunnel oven according to claim 1 +? characterized, that the material to be fired in stacks (4) at an acute angle to the transverse direction of the firing channel is set. that there are heating lanes between the stacks. Claim 4 tunnel oven according to claim 1 to 7, characterized in that that the gas flow passing through the combustion channel briefly in alternating directions vice versa. will.