Abstract:
Renovation of a heating wall, in particular a heating wall of a coke oven battery, includes starting with a vertical wall raising of a part to be renovated on a wall protective plate of the part, abutting a new masonry exactly on the wall protection plate, and arranging between the new masonry and the old masonry a vertically extending welding joint from a ceramic material.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of application Ser. No. 08/120,575, filed on Sep. 10, 1993 now U.S. Pat. No. 5,443,694. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to a method of restoring heating walls of a coke oven battery. 
     For restoration [repair] of the heating walls of a coke oven battery it is known to design the heating wall in which the old and the new masonry are separated from one another by a vertically extending slip joint. Moreover, then it is necessary to restore the head heating joint, a vertically extending expansion joint is arranged between the heating wall head and the wall protective plate. During the raising of a part of the heating wall to be restored, the process starts from the old masonry. In praxis, it has been however, shown that there are always problems with exact determination of the width of the expansion joint between the new brick-laid and not heated heating wall head and the wall protective plate under warming. 
     This situation occurs especially when several heating walls located near one another and having a different number of heating joints must be restored and/or when the position of the system including the wall protective plate-chamber frame is fixed in advance by adjacent heating wall heads which are not to be restored. It was required therefore to accurately calculate the different expansion values for different repair depths so that after heating of the heating wall head it abuts exactly against the wall protective plate and thereby the anchoring force can be transmitted from the anchoring members to the heating wall. The experience with this solution in the praxis has shown that in many cases it is not possible to calculate in advance the expansion values with the required accuracy. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide a method of restoring heating walls of a coke oven battery, which avoids the disadvantages of the prior art. 
     In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a method of restoring heating walls of a coke oven battery, which includes the steps of starting with a vertical wall raising of a part to be renovated on a wall protective plate of the part; abutting a new masonry exactly on the wall protective plate; and arranging between the new masonry and the old masonry a vertically extending welding joint from a ceramic material, wherein the arranging includes arranging the vertically extending joint by cutting a brick above and below a header brick head. 
     The welding joint is arranged either in the region of the header stone head of the old masonry or in the region of the runner stone of the latter to the heating flue to be restored. 
     When it is necessary to perform a complete restoration of the heating wall, or in other words, when the heating wall must be restored over the whole length extending from the machine side to the coke side, then in accordance with the present invention the process of wall raising starts in the above-described manner both on the wall protective plate on the machine side and on the coke side. A welding joint is arranged in a head heating flue both on the machine side and on the coke side. 
     In other words, in the inventive method the expansion joint which was provided conventionally between the heating wall head and the wall protective plate is dispensed with. The function of this expansion joint is taken up by the welding joint which simultaneously also replaces the conventional slip joint between the old and new masonry. In contrast to the expansion joint or the slip joint, the welding joint can be provided with a substantially greater tolerance with respect to its width, since this joint after heating of the heating wall is welded and a sufficient tightness is guaranteed also for greater width. The welding joint with regard to its width must not be exactly calculated in advance, but instead it can be provided with such a great tolerance that the problems during heating of the restored part of the hating wall cannot occur. The welding of the joint is performed with a refractory ceramic material, such as, for example, silica welding powder. 
     When a part of the heating wall to be restored has a great length, it can be necessary to arrange in the masonry to be restored additionally one or several vertically extending welding joints, in order to compensate the occurring expansion. 
     The method in accordance with the present invention has several advantages. 
     The new masonry abuts always exactly on the wall protective plate. While with the old masonry the expansion joint between the heating wall head and the wall protective plate was protected by laterally extending stone protecting strips, these stone protecting strips can be arrested now by the new masonry on the wall protective plates. Therefore loose stone protecting strips pose no problem 
     The anchoring locked during the wall raising can be loosened after the heating, so that the desired forces can be transferred from the anchoring posts over the whole height of the wall protective plate simultaneously to the heating wall. 
     The new masonry is supported during the heating against the wall protective plate and grows in the direction of the old masonry. Due to this supporting effect, the joint between the heating wall head and he wall protective plate is so tight that no crude gas flow from one coke oven chamber to another coke oven chamber can occur. 
     With the full renovation of a complete side [coke or machine side] of a coke oven battery, the position of the system including the wall protective plate-chamber frame-anchoring post can be exactly determined in advance, without calculating the not-completely tightly closing joint between the heating wall head and the wall protective plate. 
     The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a horizontal section of a head art for a heating wall wherein the erection is performed in accordance with the prior art; 
     FIG. 2 is a view substantially corresponding to the view of FIG. 1, wherein for erecting the heating wall the method in accordance with the present invention it utilized; 
     FIG. 3 is a view substantially corresponding to the view of FIG. 1, wherein for erecting the heating wall another variant of the inventive method is utilized; and 
     FIG. 4 is a view substantially corresponding to the view of FIG. 1, but showing still another variant of the inventive method. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 shows a heating wall in which a wall protective plate is identified with reference numeral 1 and a heating wall head is identified with reference numeral 2. An expansion joint 3 is provided between the wall protective plate 1 and the heating wall head 2. The arrows identify the position and the width of the expansion joint in the drawings. The heating wall has a conventional construction. In other words, heating flues are formed by header stones 5 and runner stones 6. In the shown embodiment the renovation of the heating wall extends up to the fifth heating flue. A slip joint 7 is provided between the fourth and fifth heating flues and separates the new masonry from the old masonry. FIG. 1 shows only a part of the heating wall which extends to the beginning of the old masonry. This is the same whether it deals with the part located at the machine side or the part located at the coke side. The structure is the same in both cases. 
     The heating wall of FIG. 2 substantially corresponds to the heating wall of FIG. 1, and the same reference numerals are utilized for the parts which correspond to the parts of FIG. 1. While in FIG. 1 the erection of the heating wall corresponds to the prior art, the erection of the heating wall of FIG. 2 is performed in accordance with the new inventive process. In accordance with the invention the expansion joint 3 is dispensed with, so that the heating wall head 2 abuts directly against the wall protective plate 1. Instead of the slip joint 7 provided in FIG. 1, a welding joint 8 is provided. It connects the new masonry with the old masonry. As can be seen from the drawing, the welding joint 8 can be formed substantially wider than the slip joint 7, so that the required tolerances for different expansion ratios of the new masonry and old masonry can be provided without difficulties. The welding guarantees a tightness of the joint which is higher than in the case of a normal slip joint. The welding joint 8 is in this case arranged in the region of the header stone head of the old masonry. 
     FIG. 3 shows an embodiment in which the welding joint 8 is provided in advance in the region of the runner stone of the last heating flue 4 to be restored. 
     As is claimed above, the inventive method can be also utilized for full renovation or for new erection of a heating wall. The erection of the heating wall corresponds in principle to the illustrations of FIGS. 2 and 3. In this case the header stone head 2 abuts directly against the wall protective plate 1 both at the machine side and at the coke side. The welding joint 8 is located in a head heating joint, for example in the third or fourth heating flue. 
     For reducing the forces acting during the heating onto the wall protective plate, measures can be taken for reducing the friction in the first horizontal slip joint located between the oven floor and the first heating wall layer. The friction can be reduced by applying a sliding medium, for example graphite paste. 
     As shown in FIG. 4, the vertically extending welding joint between the new masonry and the old masonry of the heating wall can be provided by arranging the vertically extending welding joints by cutting rectangular shaped grooves at the outer edges of the header stone heads and cutting the stones in the courses above and below the header stone heads accordingly, providing a straight vertically standing rectangular shaped groove. 
     The vertically extending welding joint between the new masonry and the old masonry can be also formed by arranging the vertically extending welding joints providing an even and straight vertically extending surface by cutting the stones above and below the header brick heads and leaving the header brick heads untouched. 
     Finally, it is possible to form the vertically extending welding joint by the combination of these two approaches. 
     It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of methods differing from the types described above. 
     While the invention has been illustrated and described as embodied in a method for restoring heating walls of a coke oven battery, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. 
     Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.