SU31368A1 - Tunnel oven - Google Patents

Description

The invention concerns a tunnel furnace with forced introduction and suction of air and gases. The proposed tunnel kiln, to control the temperatures in the heating and cooling zones by introducing into them a mixture of cold air and hot gases, having appropriate temperatures, is equipped with passing along the designated zones outside

furnaces with hot gas pipes and cold air pipes, equipped with control valves and corresponding mixing chambers.

In FIG. 1 shows the cooling zone | 1 and the tunnel furnace in the horizontal section; FIG. 2 is the same in cross section; FIG. 3-design of the heating zone in horizontal section; FIG. 4 is the same in cross section; FIG. 5- the modification of the furnace in the pitch of the section: fig. - b is the same cross section; FIG. 7 is a horizontal sectional view of the operation of the reheating zone in another embodiment; FIG. 8 is the same in the form of a flow of gases; Fig. 9 is a detail; FIG. 10-section

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Through the cooling zone JO of the tunnel furnace, it passes in the direction of the arrow of the burned material leaving the combustion zone //. The cooling air is supplied under pressure to the outlet end 72 of the furnace, so that the entire cross section of the tunnel is maintained in a state of filling with cooling medium. The suction of the heated air at the front end of the cooling zone occurs through the tubular chambers 75, which are in communication with the flue, so that the adjacent furnace section and the calcining section are not affected. In order to make suction using an ordinary blower, and the exhausted, strongly heated air is immediately used for drying purposes, etc., cold air is mixed in before entering the chamber 13, and the latter can be introduced or under pressure with using a blower 14 or through a natural gig.

FIG. 2 shows a device necessary for such mixing of air. The warm air coming out of the nozzle 75 and adjustable by stone 76,

It comes along with the cold air supplied through the pipeline 77 and passing through the annular channel 18 already in the form of a rotatedly cooled mixture into the suction chamber 75.

The heating gases for the heating zone are supplied (Fig. 3 and 4) under pressure so that flue gas is introduced through the 7P and 7P burners into distribution tubular chambers 2 / extending along most of the length of this zone1, and from these chambers the heating medium passes through regulated organs 22 to the heating zone 20. Also here, at the end of the heating zone, i.e. in the place of entry of the material being baked, suction takes place through the organs 23. In order to regulate the temperature, the processes 22 are arranged so as to add in the quantity controlled by the damper 25, cold air supplied under pressure from the pipeline 24, so that the chu of the individual processes 22 is introduced into the heating zone 20, the heating medium is adjustable, both in terms of quantity and temperature.

From the depicted in FIG. 3 curves one can see that, starting from a place of low temperature, large quantities of cold air and smaller quantities of hot gases are supplied in order to create pressure in the lower zone and to load a more sensitive temperature, i.e. . in order to increase the quantities of gases and fill them with the entire tunnel. In this way, here too, the high-temperature region is pushed into the adjacent calcining section and, accordingly, into the hotter part of the heating section, and at the same time a sudden increase in temperature is achieved in favor of a long low-temperature zone. Large amounts of gases in this area heat the inside of the load, so that there is a great guarantee that the load is heated up and down as evenly as possible.

According to the device shown in FIG. .5 and b, further improvement for preheating can be achieved. Namely, in order to have the ability to maintain the temperature curve required in the heating zone with an unconditional accuracy of the same

In the upper and lower parts of the various tunnel sections, the gases introduced under pressure at each supply point spread along the height of the tunnel so that a part of them supplied through the upstream channels 26 are even more cooled, by means of further-: additives from branches 27 th 28 After blending, the gases along with the gases flowing along the tunnel in its upper part give, after mixing, the same blend temperature as gases brought to the lower part of the trolley and mixed from the very beginning to the temperature needed / for corresponding segments of the tunnel.

 This makes it possible to drive par to bots in short tunnel kilns, with uniformly uniform temperatures at the top and bottom, therefore, with a certain heating curve, and also to have an opportunity to influence the heating zone. A further advantage of such a device is that, if necessary, the heating section 77 can be operated with strong suction at the entrance without compromising the accuracy of temperature and temperature and without damaging the burning zone due to high pressure, as is the case when; These gases, which are adjacent to the burning zone, are partially transferred into it and cannot be expelled towards the introduction end of the kiln. If, even with this, a little more cool gases before they were mixed with more hot tunnel gases would get on more; warm stones would not be significant.

If you wish, you can do it in such a way that you can supply gases to the tunnel at the height of the floor of the trolley and part of it to cut off, and bring all of them to the street in a colder state. By this way, the hot gases flowing up along the length are also cooled, as the descending flow supplied from Above intersects them.

 The fact that in this way, the mass of gas to be sucked from the heating zone from the end of the stack of material to be burned would have increased excessively and would result in temporary longitudinal currents in the additional channel, then in a modified form shown in FIG. 7-10% do AK:

the mass of gas corresponding to the furnace at the end of the preheating zone is sucked each time at the end of the load, while the desired increase in volume is maintained only within the critical temperature zone and, moreover, a constant mass of large gases turns around, which is regulated in quantity and temperature by adding fresh air and by partially blowing to the roof or to the dryer. In order to suck this wrapped mass, it is recommended to produce it through the central pipes inserted into the stack of material to be baked so as to achieve a uniform distribution of heat. In this case, it is advisable to use the reverse direction of the gas to be wrapped so that in the tunnel there is generally formed a cross-flow, in which the calcined material is covered in the most uniform way. ,

In the heating zone 2b (Fig. 7), hot gases are introduced in the usual way; these gases are sucked off by means of a blower / through pipe 30 extending to the critical temperature zone. In this case, such suction occurs (Fig. 10) through the central pipes 33 inserted into the stack 32 of firing material; these pipes can be brought into communication with the help of an ascending and descending pipe 34 with a pipeline 30, by means of a lever mechanism shown in FIG. 9, whereby the message may be interrupted to advance the carts. The air sucked by the blower 37 is supplied, if necessary, with the addition of cold outside air, through the nozzle 35 or Li, with a partial discharge, the amount through the pipe 36 to the branching pipe 37 so that through the channels 38 in the roof again be introduced into tunnel space 20. Thus, for suction into the pipe 30 gases entering the furnace from pipes 37 or through channels 38 serve as vertically mobile

pipes 39 connected to a common lifting device (FIG. 9) and lowered into the pile 32 (FIG. 10).

In this way, a constant wrap of gas mass is created (Fig. 8) within the critical temperature zone, so that at the end of the loading stack through the suction ports 23, in essence, only water vapor must be sucked off. At the same time, the suction of the gas mass within the length of the critical zone occurs in such a way that exchange with the inside of the stack of material to be burned is ensured, while the method of reverse control entails a cross-flow penetrating the entire stack of material to be burned.

The subject of the patent.

Claims (3)

1.Tunnel furnace with forced introduction and suction of air and gases, characterized in that in order to control temperatures in the heating and cooling zones by introducing into them mixtures of cold air and hot gases, having corresponding temperatures, the The furnaces are tubular chambers J3, 21 for hot gases and pipes 77, 24 for cold air, equipped with control valves 25 and corresponding mixing chambers adjacent to the side openings of the furnace tunnel (Fig. 1-4). 2. The form of the tunnel furnace according to claim 1, characterized in that in order to cool two successive intakes of hot gases supplied through the channels 26, the cold air supply pipes have two branches 27 and 2 (Fig. 5-6) . 3. The form of the tunnel furnace according to claim 1, characterized in that for sucking into the pipe 30 gases entering the furnace from pipes 57 through channels 38, are vertical moving pipes 39 connected to a common lifting device (Fig. 9) and lowered deep into  stack 32 (FIG. 10);