GB1575493A - Heating wall for coke ovens - Google Patents

Description

(54) HEATING WALL FOR COKE OVENS (71) We, GOSUDARSTVENNY VSES OJUZNY INSTITUT Po PROEKTIROVANIJU LENNOSTI, of Sumskaya ulitsa 60, Kharkov, Union of Soviet Soscialist Republics, a Corporation organised and existing under the laws of the Union of Soviet Socialist Republics, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described, in and by the following statement:- The invention relates to heating walls for coke ovens, particularly coke ovens having a horizontal coking chamber confined between two heating waITs which comprise vertical heating flues arranged in pairs.

Modern coke ovens with horizontal coking chambers confined between heating walls which comprise vertical heating flues arranged in pairs are finding ever increasing use in industry. Every pair of vertical flues is provided with a separating partition formed with a flow port at the top. The flow port is intended for passing combustion products from one vertical flue to the other.

The separating partition is also provided with a recirculation orifice in the bottom portion.

In operation, gas and air are supplied to one vertical flue of every pair. Thus, combustion occurs simultaneously within half of the wall heating flues. Combustion products pass through the flow port from one flue into the other, i.e. adjoining vertical flue, flow downwards and out of the flue on the way to a checker chamber. A portion of combustion products returns through the recirculation orifice into the vertical heating flue in which combustion takes place.

Gas flow in the adjoining vertical heating flues periodically changes direction, i.e.

combustion takes place alternately in one or the other flue, and accordingly combustion products are removed through the adjoining flue, a predetermined amount of combustion products being constantly passed through the flow port in one or the other direction.

Heat resulting from combustion is transferred to the oven cooking chamber where coal charge is transformed into coke without air access.

In the process of coking coal charge shrinks. Depending on the granulometry and composition of the coal charge and on the coal resources base, the coal charge shrinkage value varies. According to an anticipated coal charge shrinkage value the requisite heating level is selected for a specific coke oven battery, i.e. the distance between the coking chamber top and the flow port top. However, the resource base and coal grades are sometimes changed, and accordingly, the charge shrinkage value is changed which, with a constant heating level in a particular coke oven battery, causes under or overheating of the coke cake upper portion. This results in a deterioration in the coke oven operating conditions and coke quality and in lower production rates.

What is desired is a coke oven heating wall which allows for temperature to be changed in the upper portion of the coking chamber according to changes in coal charge shrinkage. The flow port should be of such a design that the vertical position of the effect flow port can be changed without changing the passage cross-section of the effective flow port or the clear opening of the vertical heating flues along their full vertical extent.

The present invention provides a heating wall of a coke oven with a horizontal coking chamber, the heating wall comprising vertical heating flues arranged in pairs, each pair of adjoining flues being separated by a partition formed in its upper portion with a flow port through which combustion pro ducts flow from one vertical flue into the other and which is provided with vertical slot-like guides each formed in its upper portion with a rebate, and a slide gate whose vertical extent is less than that of the flow port and whose sides are formed with vertically-elongate lateral projections entering the respective guides, the slide gate being movable between a lowermost position and an uppermost position in the flow port, the centre of gravity of the slide gate being shifted with respect to the plane contain- ing the longitudinal axes of the projections in the direction away from the rebates, the vertical extent of-the rebates being sufficient to allow tilting of the slide gate in its uppermost position so that the projections enter the rebates so as to retain the slide gate in its uppermost position, the slide gate having means for receiving a member for vertically displacing the slide gate.

A coke oven heating wall of such a design affords, as compared to prior art, a possibility to change the temperature within the coking chamber upper portion by moving the slide gate into the uppermost or lowermost position in the flow port. This makes it possible to coke differently shrink- ing coal charges, i.e. coals of various grades.

As the guides with the slide gate movably mounted therein are arranged vertically, the vertical heating flues are free of internal projections which increase flow resistance and decrease heat transfer from the walls.

Coke quality is improved, owing to the possibility of controlling temperature within the coking chamber upper portion to provide necessary heating conditions for the coke cake.

The slide guide is preferably provided with at least one through-opening tapering in the direction opposite to that in which the slide gate centre of gravity is shifted, to allow tilting of the slide gate on a hook or other member received by the opening or openings.

Alternatively, a recess may be formed in the slide gate face facing in the opposite direction to that in which the slide gate centre of gravity is shifted, the top surface of the recess being upwardly inclined in the direction in which the said centre of gravity is shifted, to allow tilting of the slide gate on a hook or other member received by the recess.

The invention will be described further, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a fragmentary cross-sectional, view of a heating wall of a coke oven, namely a view of the upper portion of a pair of vertical heating flues separated by a partition having a flow port in which a slide gate is guided; Figure 2 is a cross-section taken along the line II-II in Figure 1; Figure 3 is a cross-section taken along the line III-III in Figure 1 showing the slide gate in the lowermost position; Figure 4 is a side view of the slide gate; Figure 5 is a cross-section taken along the line V-V in Figure 4; Figure 6 shows a side view of an alterna tive slide gate, partly in section; Figure 7 is a cross-section taken along the line VII-VII in Figure 6; and Figure 8 is a cross-section through a flow port with a slide gate in the uppermost position.

The coke oven partly illustrated in Figures 1 to 3 includes a horizontal coking chamber (not shown) confined between heating walls, one of which is shown. The heating wall incorporates paired vertical heating flues 1 and 2 with a cover 3 provided with passages 4 and 5. Every pair of flues 1 and 2 is separated by a partition 6 formed with a flow port 7 in the upper portion. The sides of the flow port 7 (Figure 2) are provided with vertical slot-like guides 8 having rebates 9 in the upper portions. A slide gate 10 is mounted in the guides 8. The sides of the slide gate 10 are formed with vertically-elongate lateral projections 11 which are inserted into the slots of the guides 8, the vertical extent of the projections 11 being less than the vertical extent of the rebates 9 in the guides 8.The centre of gravity C of the slide gate 10 is shifted relative to the plane containing the longitudinal median axes of the projections 11 (see Figure 4).

The slide gate 10 is formed with means for receiving a hook 12 of a rod 13 to displace the slide gate.

Figures 4 and 5 show an embodiment of the slide gate 10 having the means for introducing the hook 12 of a rod 13 formed as two conically tapering through-opemugs 14 narrowing in the direction opposite to that in which the slide gate centre of gravity C' is shifted, to provide for the slide gate 10 swinging in a vertical plane on the hook 12 of the rod 13.

Figures 6 and 7 show a further embodiment of the slide gate 10, wherein the means for receiving the hook 12 of the rod 13 is formed as an undercut recess 15 Figure 6 in the face which is farther from the centre of gravity C. The top 16 of the recess 15 in inclined with respect to the horizontal to provide for swinging of the slide gate 10 in a vertical plane of the hook 12 of the rod 13.

The heating level, i.e. the distance from the coking chamber top (not shown) to the upper edge of the flow port 7 and, consequently, the temperature within the coking chamber upper portion, is adjusted as follows.

When the coal charge shrinkage exceeds the rated level, i.e. the coke top level towards the end of coking will be below the rated one, the slide gate 10 is brought into the uppermost position. This is carried out in the following manner. The rod 13 with the hook 12 is lowered into the flue 1 through the passage 4 (Figure 1). ' The hook 12 is inserted into the openings 14 or the undercut recess 15 of the slide gate 10. As the rod 13 moves upwards, the hook 12 draws the slide gate Ip with it.As the bottom edges of the projections 11 reach the edge of the rebates 9 in the guides 8, the slide gate 10 is tilted in the vertical plane under the effect of gravity, the upper ends of the projections 11 then abutting against the guides 8 and the bottom ends of the projections 11 entering the rebates 9 and resting on the edges of the rebates 9.

The slide gate position in the guides-8 is fixed owing to the shifted centre of gravity C (Figure 8). The hook 12 is brought out of the slide gate 10, and the rod 13 removes the hook from the flue 1 through the passage 4.

As a result, combustion products flow from one vertical heating flue 2 into the other 1 on a lower level proportionate to the slide gate height, and the temperature within the upper portion of the coking chamber (not shown) decreases. This, in turn, prevents the coke cake top and the coking chamber roof (both not shown) from overheating.

If the coal charge to be coked shrinks less than the preceding charge (which in practice is not infrequent), the slide gate 10 is lowered from its uppermost position in the flow port 8. This is carried out in the following manner. The rod 13 with the hook 12 is introduced into the flue 2 through the passage 5. The hook 12 is brought under the slide gate 10 to lift the slide gate a little so that it occupies an upright position.

Thereafter the hook 12 lowers the slide gate 10 until it rests on the bottom of the flow port 7 (Figure 1). The hook 12 is brought out from under the slide gate 10 and is removed by the rod 13 from the flue 2 through the passage 5. When the slide gate 10 rests on the bottom of the flow port 7, the bottom edge level of the flow port 7 is raised by the height of the slide gate 10. Thus, combustion products flow from one vertical flue 2 to the other 1 on a higher level which is proportionate to the slide gate 10 height.

As a result, the temperature within the upper portion of the coking chamber becomes higher, and this in turn provides for sufficient heating of the coke cake top and of the coking chamber roof (not shown).

Thus, by positioning the slide gate 10 at the top or at the bottom of the flow port 7 it is possible to change the vertical position of the effective flow port by the slide gate height, the effective passage crosssection of flow port remaining substantially unchanged. Furthermore, if the slide gate height is 200 to 250 mm, the vertical position of the effective flow port will be changed' by the same value, which corresponds to the practical range of the coal charge shrinkage. Accordingly, by chang- ing the position of the slide gate it is possible to provide a requisite heating of the coke cake, i.e. to prevent it from overheating or underheating and, consequently, to improve the quality of the coke produced.

To afford a better understanding of the essence of the invention, the heating wall in the above embodiments is represented by a single pair of adjacent vertical heating flues.

However, the heating wall in fact consists of a plurality of vertical heating flues arranged in pairs.

WHAT WE CLAIM IS: 1. A heating wall of a coke oven with a horizontal coking chamber, the heating wall comprising vertical heating flues arranged in pairs, each pair of adjoining flues being separated by a partition formed in its upper portion with a flow port through which combustion products flow from one vertical flue into the other and which is provided with vertical slot-like guides each formed in its upper portion with a rebate, and a slide gate whose vertical extent is less than that of the flow port and whose sides are formed with vertically-elongate lateral projections entering the respective guides, the slide gate being movable between a lowermost position and an uppermost position in the flow port, the centre of gravity of the slide gate being shifted with respect to the plane containing the longitudinal axes of the projections in the direction away from the rebates, the vertical extent of the rebates being sufficient to allow tilting of the slide gate in its uppermost position so that the projections enter rebates so as to retain the slide gate in its uppermost position, the slide gate having means for receiving a member for vertically displacing the slide gate.

2. A heating wall as claimed in claim 1, in which the slide gate has at least one through-opening tapering in the direction opposite to that in which the slide gate centre of gravity is shifted, to allow tilting

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. When the coal charge shrinkage exceeds the rated level, i.e. the coke top level towards the end of coking will be below the rated one, the slide gate 10 is brought into the uppermost position. This is carried out in the following manner. The rod 13 with the hook 12 is lowered into the flue 1 through the passage 4 (Figure 1). ' The hook 12 is inserted into the openings 14 or the undercut recess 15 of the slide gate 10. As the rod 13 moves upwards, the hook 12 draws the slide gate Ip with it.As the bottom edges of the projections 11 reach the edge of the rebates 9 in the guides 8, the slide gate 10 is tilted in the vertical plane under the effect of gravity, the upper ends of the projections 11 then abutting against the guides 8 and the bottom ends of the projections 11 entering the rebates 9 and resting on the edges of the rebates 9. The slide gate position in the guides-8 is fixed owing to the shifted centre of gravity C (Figure 8). The hook 12 is brought out of the slide gate 10, and the rod 13 removes the hook from the flue 1 through the passage 4. As a result, combustion products flow from one vertical heating flue 2 into the other 1 on a lower level proportionate to the slide gate height, and the temperature within the upper portion of the coking chamber (not shown) decreases. This, in turn, prevents the coke cake top and the coking chamber roof (both not shown) from overheating. If the coal charge to be coked shrinks less than the preceding charge (which in practice is not infrequent), the slide gate 10 is lowered from its uppermost position in the flow port 8. This is carried out in the following manner. The rod 13 with the hook 12 is introduced into the flue 2 through the passage 5. The hook 12 is brought under the slide gate 10 to lift the slide gate a little so that it occupies an upright position. Thereafter the hook 12 lowers the slide gate 10 until it rests on the bottom of the flow port 7 (Figure 1). The hook 12 is brought out from under the slide gate 10 and is removed by the rod 13 from the flue 2 through the passage 5. When the slide gate 10 rests on the bottom of the flow port 7, the bottom edge level of the flow port 7 is raised by the height of the slide gate 10. Thus, combustion products flow from one vertical flue 2 to the other 1 on a higher level which is proportionate to the slide gate 10 height. As a result, the temperature within the upper portion of the coking chamber becomes higher, and this in turn provides for sufficient heating of the coke cake top and of the coking chamber roof (not shown). Thus, by positioning the slide gate 10 at the top or at the bottom of the flow port 7 it is possible to change the vertical position of the effective flow port by the slide gate height, the effective passage crosssection of flow port remaining substantially unchanged. Furthermore, if the slide gate height is 200 to 250 mm, the vertical position of the effective flow port will be changed' by the same value, which corresponds to the practical range of the coal charge shrinkage. Accordingly, by chang- ing the position of the slide gate it is possible to provide a requisite heating of the coke cake, i.e. to prevent it from overheating or underheating and, consequently, to improve the quality of the coke produced. To afford a better understanding of the essence of the invention, the heating wall in the above embodiments is represented by a single pair of adjacent vertical heating flues. However, the heating wall in fact consists of a plurality of vertical heating flues arranged in pairs. WHAT WE CLAIM IS:

1. A heating wall of a coke oven with a horizontal coking chamber, the heating wall comprising vertical heating flues arranged in pairs, each pair of adjoining flues being separated by a partition formed in its upper portion with a flow port through which combustion products flow from one vertical flue into the other and which is provided with vertical slot-like guides each formed in its upper portion with a rebate, and a slide gate whose vertical extent is less than that of the flow port and whose sides are formed with vertically-elongate lateral projections entering the respective guides, the slide gate being movable between a lowermost position and an uppermost position in the flow port, the centre of gravity of the slide gate being shifted with respect to the plane containing the longitudinal axes of the projections in the direction away from the rebates, the vertical extent of the rebates being sufficient to allow tilting of the slide gate in its uppermost position so that the projections enter rebates so as to retain the slide gate in its uppermost position, the slide gate having means for receiving a member for vertically displacing the slide gate.

2. A heating wall as claimed in claim 1, in which the slide gate has at least one through-opening tapering in the direction opposite to that in which the slide gate centre of gravity is shifted, to allow tilting

of the slide gate on a member received by the opening or openings.

3. A heating wall as claimed in claim 1, in which a recess is formed in the slide gate face facing in the opposite direction to that in which the slide gate centre of gravity is shifted, the 'top surface of the recess being upwardly inclined in the direction in which the said centre of gravity is shifted, to allow tilting of the slide gate on a member received by the recess.

4. A heating wall for a coke oven, substantially as described herein with reference to the accompanying drawings.