DE3125886A1 - METHOD FOR HEATING COOKING OVENS AND DEVICE FOR CARRYING OUT THE METHOD - Google Patents

Description

Essen, June 30, 1981 N 4849/5 a Vo / Wi.

KRUPP-KOPPERS GMBH, Moltkestrasse 29, 4300 Essen 1

Process for heating coke ovens and equipment for carrying out the process.

The invention relates to a method for heating coke ovens with the help of circular flows in the heating flues as well as a facility for carrying out the procedure. The aim of heating coke ovens is to achieve a6 well cooked Coke of uniform quality due to uniform heating.

Since the chamber width of coke ovens increases from the machine to the coke side, the heat demand from heating flue to heating flue also increases in the same direction. Through appropriate distribution of the heating media, the horizontal uniformity of the heating is achieved. Conversely, however, to change the heat demand, i.e. the cross-sections of the heating flues decrease in the same direction. This results from the machine side to the coke side towards greater velocities of the combustion gases and greater flame lengths. These influence the vertical uniformity of the heating.

Now you can lengthen the flames by using the Circulating current, i.e. by sucking in burned-out exhaust gas from the falling heating flue into the rising, flamed one Heating draft, whereby the burned-out flue gas is mixed with the freshly supplied combustion media. This reduces the initial concentrations of the reaction media, and

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the course of the combustion reaction is delayed, i.e. the Flames are lengthened. This is a function of the intensity of the circulating current.

The use of the current circuit for heating coke ovens is known and proven. However, it has been shown that the flame lengths from the machine to the coke side must be influenced differently by the circulating current.

For this purpose, the invention proposes that the intensity of the circular currents from the machine to the coke side be continuous or is formed discontinuously variable. The amount of the back-sucked flue gas is assumed to be below the intensity of the current circuit understood in relation to the amount of flue gas formed from the freshly supplied combustion media gas and air.

The invention initially provides that this variation takes place in a decreasing manner from the machine to the coke side. The variation the circulating current intensity can be carried out continuously from heating duct pair to heating duct pair or in groups will. Under group-wise grading, this can be done with Uniform grading from group to group from the machine to the coke side can be understood, with several pairs of heating flues each forming a group.

The graduation of the circulating current intensity in a heating wall can, however, also take place discontinuously. For example, it can in part of the heating flues of a heating wall in small steps

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widths take place, while after a gfossen in the following heating flues again small step widths come into effect, here the flow ratio should se in the first part of the heating wall in a small scatter area with laminar flow and in the other part of the heating wall in a again small scatter range with turbulent flow.

However, such a variant can also be discontinuous Grading may be required that the circulating current strength in some Heating flues of a heating wall must increase in the direction of the coke side, while it decreases in the other.

It is known that the circulating current has a self-regulating effect. This self-regulating effect of the circulating current consists in the fact that the amount of circulating current decreases as the furnace output increases, while the amount of flue gas sucked in is increased when the heating output decreases. Thanks to this effect, the flame lengths can be kept almost constant over a wide range, even with fluctuating furnace outputs will. This effect is also very beneficial to the heating requirements in the case of composite ovens. With lean gas heating, a lower circulating current is required, with high-gas heating a stronger one. Since larger ones with lean gas heating Exhaust gas quantities are primarily generated than with high-gas heating, is automatically set by the lean gas heating self-regulating effect and less smoke gas suction a. Thus, the circular current equals through its self-regulating

(ρ

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Intensity effect, the requirements of the different types of underfiring gas automatically almost completely.

Invention ε according to s, the settings of the circuit are current intensities in the various heating flues of a heating wall through structural design or adjustment of the resistances in the Flow paths chosen so that there is a change in power or gas type the furnace heating, the self-regulating effect of the electricity circuit is optimally used.

Since the intensity of the circulating currents in the heating flues is essentially due to the size of the circulating current and reversing point cross-sections is influenced in the truss walls, the invention provides that these cross-sections over the entire length of the wall or in zones individually or together from the machine to the coke side can be varied. In the case of a common change, this can take place proportionally, in the same direction or in the same direction.

The invention provides that the total cross-sections per circulating current or reversal point consist of one or more openings. It also provides that each or every one of these openings can be provided with one or more throttling devices, e.g. slides or flaps.

The invention also provides that the intensities of the circle flow in the heating flues by additional gas jets of increased speed in a manner known per se - if necessary different - be reinforced,

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The invention is illustrated in the drawing, for example. Show it :

1 shows a vertical section through a pair of heating cables and FIG. 2 shows a section along the line A-A of FIG.

With 1 and 2, the two heating flues are referred to, which form a pair of heating flues and alternately flamed upwards in a known manner will. This pair of heating flues - also known as twin heating flues - represents a section of a heating wall that consists of a large number of there are twin heating flues to the left and right up to the machine or coke side.

The partition 3 of the heating flues 1 and 2 has at its lower

on,

At the end of two circle flow openings 4 / which in the present case are each closed with one or more flaps 5 can be. According to the invention, as explained in more detail above, the cross-sections of the circular flow openings are different from the machine side to the coke side.

At the upper end of the partition 3, the heating flues are in the embodiment shown by two superimposed Openings 6 and 7, the so-called reversal places, connected to each other. Each of these openings is in the present case a boll 8 or 9 assigned, which can completely or partially open this opening or also practically completely close it. The cross-sections of the two reversal points are preferably just like those of the circle flow openings from the machine to the

Coke side laid out differently. .-

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Claims (10)

-J / * - 30. 6. 1981 N 4849/5 a Patent claims: 1. A method for heating coke ovens with the aid of circulating currents in the heating flues, characterized in that the intensity of the circular flows in the heating flues from the machine side to the coke side of the furnace is continuously or discontinuously variable. 2. The method according to claim 1, characterized in that the intensity of the circulating currents decreases from the machine side to the coke side. 3. The method according to claim 1, characterized in that the intensity of the circular flows from the machine to the coke side increases in some heating flues. 4. The method according to claim 1, characterized in that the intensity of the circulating currents from the machine to the coke side varies continuously or in groups will. 5. The method according to claim 1, characterized in that additional gas jets increased in a manner known per se Speed can be blown into the heating flues. 6. Device for performing the method according to claims 1 to 5, characterized in that the large the circulating current and / or reversing point cross-sections (4 resp. -jf- ■ June 30, 1981 N 4849/5 a 6.7) Between the rising and falling heating flues (1, 2) formed continuously and / or stepped are. 7. Device according to claim 6, characterized in that when changing the cross-sections of the circulating current and reversing • openings (4 or 6, 7) from the machine to the coke side the same takes place proportionally, in the same or in opposite directions. 6. Device according to claim 6, characterized in that the Kreigstrom- and / or reverse part cross-sections each consist of one or more openings. 9. Device according to claim 8, characterized in that all or individual openings with one or more Control instruments (5), e.g. flaps or slides, are provided are. 10. Device according to claim 6, characterized in that means, e.g. nozzles, for blowing in additionally the circular currents driving gas jets are provided.