DE1944706A1 - Process for circulating heating of brick kilns with natural gas - Google Patents

Description

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description

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KOHO- DS GDPIPlRI MIITISZ [Di] RIUM Tüzelestechnkai Eutatointezet, Miskolc, Egyetemvaros, Hungary

concerning

PROCESS FOR CIRCULATION HEATING OF BRICK FURNACES WITH NATURAL GAS (Priority -of September 9, 1968, Mr. BI- "513-, Hungary)

The invention is a method for heating the Urals of brick kilns with natural gas. ·

There are two solutions for gas heating brick kilns known: the lower firing and the upper firing. The common disadvantage of both methods is that they involve impossible for them, the low volume 1036/12 <£ lt. / Kne "·

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To distribute fuel gas in the furnace chamber such (with the ^{incineration,} air to be mixed, thereby to burn), that at each point of the feathers Ofenraumea an even temperature is created. For this reason, none of the conventional brick-firing processes is suitable for producing bricks of uniform quality, since, as a result of the unevenly developing temperatures in the furnace, the chemical reactions in the material. deviate from the required extent d, hi run too weak or too strong,.

The underfiring is based on construction 3 reasons only used with gas ring ovens. Because of such shortages as e.g. the frequent clogging of the on the floor of the combustion chamber arranged gas nozzles and the resulting uneven distribution of the heating gas is this construction slowly pushed out of use worldwide. Another Another disadvantage of underfiring is that the flame near the bottom is not yet warm enough such a burning out of the raw bricks arranged in the lower part of the chamber is not even possible »

For this reason, in practical "use all over the world, only the top firing is used, with this one The solution is the natural gas through the furnace vault guided drilling from top to bottom into the fire zone of the Passed through the furnace, where it then burns with the air flowing in the brick stack arranged like a framework. To the • heat development on the horizontal cross-section of the fire zones Relative to ensure evenly, the gas is at the Top firing through many nozzles "distributed into the fire zone. However, with this procedure only one becomes the base realizes proportional gas distribution related to the fire zone, which alone is not enough because the distribution ment in relation to the volume of the fire zone continues remains uneven. It is for this reason that it burns out of the lower part of the brick stack is insufficient even with conventional overfiring, whereas the upper, Part of the stack under the vault burned out too much will. It should be noted that this is the burning process at least for those on the same level

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bricks are made uniformly, and this in contrast to the underfiring, in which as a result of the clogging of a Some of the nozzles located in the furnace floor do not even have these Condition is met. The ones with conventional top firing That is why brick kilns cannot be produced in terms of volume - d, h. not only with regard to the base but also with regard to the height - ensure uniform gas-air mixing, i.e. * gas distribution, as they ensure the im In relation to the air volume, the amount of heating gas is far too small divided into many small rays, the cohesion depth of which, i.e. Flame length is short. The short flames are made by the Air flow and mainly deflected by the effect of the buoyancy force already at the vault and are not sufficient to the greater depths of the furnace. As a result, a hot, a low specific one develops under the fire zone vault Weight-bearing flue gas ^ layer, which the upper Bricks of the brick pile burns out too much, with the lower one Part of the stack remains unburned as neither there Flames still warm smoke gases penetrate because of the buoyancy can.

The aim of the invention is. the elimination of the aforementioned disadvantages. ·

The process of the subject of the invention allows a more complete solution to the heating of brick kilns (tunnel furnaces Gasring- etc.) with operating temperatures of 900 to 1000 ⁰ C.

The essence of the invention is that the natural gas is not distributed in many small jets, but in order to ensure a large penetration depth locally Blown in concentrated through the holes in the furnace vault * To ensure even heat distribution across the whole To reach the area of the fire zone, the facility changes the Place of concentrated blowing in time in such a way that that the gas with the help of switching elements, once on the one, once on the second, once on the third, etc. the Rows of nozzles is diverted.

Essentially, the invention is a circulating heater and solves in contrast to the previous method

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the contradiction between the division of the heating gas into many small rays (i.e. the condition of uniform Distribution) and the low Sindring depth of the small gas, shine on * '-.,

This ensures that the entire amount of the natural gas required for heating the furnace is fed into the Furnace by numerically few, but larger: diameter and higher speed on pointing gas jets takes place, which to meet the requirement for even gas distribution alternately in time at other locations in blown into the fire zone of the furnace.

The invention is accordingly a method for circulating heating of brick kilns with natural gas »thereby marked. draws that the entire amount of heating gas through the arranged in the furnace Gas nozzles alternating in place and time, into the .. Base area of the furnace fire frame is guided »

The inventive method is based on the example of the brick kiln ring kiln shown in the drawing described according to Hoffmann:

In Fig. 1 the heater itself is above the Furnace vault on the conventional furnace stand; arranged as well as the cross-section of the fire zone can be seen.

In Fig. 2, which is a plan view, are the 6 arranged above the fire zone of the gas ring furnace to see independent heating devices.

The natural gas flows through the on the furnace vault arranged ring line 11 with constant pressure to the through the zone 12 lockable consumer points 13 and arrives by one of the 6 independent devices shown in Fig. 2 in the oven. :

Each heating device has a local control unit, marked with hatched squares in Fig. 2, which has a shaft driven by the synchronous motor 22 that revolves once per minute * and a cam disk 24 attached to it with a section of 5/6 on its circumference (to be seen in profile in Fig. 1;> ^ the mercury switch 23 and the signal lamp 21, in which the arrangement delimited by a broken line in Fig. 1 contains * '.-' ■ " ^: ■ ·.". " ^r ■ - ■■■■ ■ ■■ + ?? - <· -. ■ = .---. · · Ν.

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When closing the manual toggle switch 25 twisted the synchronous motor the cam 24 and the mercury switch 23 closes for 1/6 of the orbital time of the wave, ie. " for IO see. The signal lamp 21 lights up, the solenoid valve 14 opens and the natural gas flows through the manual valve 15, the horns 18, the elastic tubes 19 and the chrome steel nozzles 20 in the corresponding fire zone as well as in the Corresponding capacity of the stove »There it burns the gas in the air flowing through the stack of bricks arranged like a framework. This process is shifted afterwards 10 see from device 1 to device 2 and after others 10 see on device 3 etc.

Before starting the heating devices the switches 23 of all devices individually in the basic division to bring »This is done in such a way that one at in the closed position of the cock 12, the manual toggle switch closes and at the moment when the signal lamp 21 lights up, the manual toggle switch 25 triggers.

The synchronization of the 6 heating devices, which is required for the first start-up, takes place in such a way that one moves in the direction of arrow 2? (in the direction of flow of the combustion air) first turns on the toggle switch 25 of the heating device 1. The signal lamp 21 of the control unit in the basic position lights up (the solenoid valve 1/14 opens, etc.), and as soon as the signal lamp 1/21 goes out, the device 2 is switched on immediately using its toggle switch 2/25 . Operation * In. Similarly, with the help of switches 3/25, 4/25, etc., all 6 heating devices that have already been brought to their basic positions are put into operation. . ·

After the devices arranged on the gas ring furnace have been put into operation, the required gas consumption will be of the furnace is set by regulating the pressure level in the ring line 11, when the firing temperature is almost reached the fire zone is with the help of the hand valves 15 and the hand taps 18 - if necessary - the technologlach necessary and the base area corresponding temperature distribution of the fire zone (as with the conventional

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Upper firing) for the purpose of determining the burnout speed set of bricks.

The method according to the invention is also applicable to the upper Natural gas firing in a tunnel furnace similar to the one described above, however with the / difference that the fire is there does not move and so the fire zone temporarily does not have to be relocated, since the carriages are moved in the tunnel kiln. ·

The main advantage that can be achieved by using the invention is that, in contrast to the previous solutions, it is possible to use gas-fired heating of large-scale brick kilns. Another advantage of using the invention is the fact that the surface layers of the brick material in the wind breaks can transfer the heat to the inner parts of the brick material and that this circumstance in materials with limited heat conduction, such as the red is bricks of particular importance because in this way it can be avoided that the surface See ns chichten an accumulation of heat and "by the way, a high combustion temperature having gas flames heat the surface of the bricks more than the required temperature of 900 to 1000 ⁰ G * This allows the furnace output to be increased while at the same time improving the brick quality »

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Claims (1)

19U706 PATENT CLAIM I. Process for circulating heating in brick kilns with natural gas is characterized by the fact that the Total amount of the heating gas through gas nozzles used alternately in place and time in the Grundflachenzoneη des Furnace firebox is performed. , ' - 7 0098 18/1172 L e r s e i t e