Patent Publication Number: US-8529734-B2

Title: Wall protector for a heating wall head between two oven chamber openings of a coke oven battery

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is the US national stage of PCT application PCT/EP2009/003399, filed 13 May 2009, published 26 Nov. 2009 as 2009/141086, and claiming the priority of German patent application 102008024573.9 itself filed 21 May 2008. 
     FIELD OF THE INVENTION 
     The invention relates to a wall protector for a heating oven head between two chamber openings of a coke-oven battery that is laterally bounded by vertical jambs extending along the chamber openings. The insulating device comprises a vertical anchor post located in front of the heating oven head, as well as biasers that are fixed to the anchor post. Moreover, the insulating device is provided with U-shaped yoke elements that are prestressed by the biasers, as well as a rectangular head cover. 
     BACKGROUND OF THE INVENTION 
     From DE 37 41 301, a wall-protection plate for coking ovens is known. Coking ovens of the type described there are collectively referred to as coke-oven batteries, so that the chamber openings are always opened to one side. The masonry between these chamber openings that are provided with heavy coke-oven doors in a sequence of chambers is termed the heating wall head and consists primarily of silica insulating mixture, firebrick or sillimanite. The chamber openings are each surrounded by an chamber frame that receives the respective coke-oven door and that extends over part of the heating wall head on one side with its vertically extending profiled jamb. The still open heating wall section between the vertical profiles of the chamber frames of adjacent chamber openings is covered by the wall-protection plate. Based on the thermal load to which the masonry of the heating walls is exposed at temperatures of over 1,000° C., robust anchoring is required to hold the masonry together. The vertical jambs that delimit the heating wall head laterally are therefore supported at several points against an anchor post fixed in front of the heating wall head, this the anchor post being fixed at its upper and lower ends. 
     At the same time, there is a need for a gas-tight gasket seal of the heating wall head to avoid emissions. Previously this sealing was accomplished by inserting insulating mats between the jambs and the heating wall head, as well as by caulking a mortise groove formed between the jambs, the oven head masonry and the wall protection plate. 
     Beyond that, these wall protection plates have the function of transmitting the required anchoring forces, as a result of which the plates became very thick and thus also became heavy and unwieldy. The thick plates react sensitively to temperature differences, which leads to thermal bending of the plates that acts counter to the anchoring forces. The desired application of force onto the heating wall head masonry is thereby changed disadvantageously. 
     OBJECT OF THE INVENTION 
     Given this background, the object of invention is to provide a wall protector for a heating wall head that satisfies the functions described above, and that does not require a massive wall protection plate. 
     SUMMARY OF THE INVENTION 
     Based on a wall protector with the characteristics described above, the object is attained in accordance with the invention in that the prestressed U-shaped yoke elements abut in a force-fit at bearing faces of the vertical jambs, and that the head cover consists of thin-walled sheet metal that is clamped between the jambs and the heating wall head. The vertical jambs that delimit the heating wall head and extend along the chamber openings are prestressed directly by the yoke elements with the necessary anchoring force, without a detour over the massive plate. The sealing is accomplished by means of the sheet metal retained in a force-fit between the heating wall head and the chamber frame. The wall protection in accordance with the invention offers the advantage that the sheet metal adapts to the shape of the wall and the frame, as a result of which a sealing effect is achieved. The flexible, thin-walled design of the head cover as sheet metal offers, beyond that the advantage that thermal bending is significantly lowered with respect to more massive material, as a result of which an improved adaptation to the shape of the heating wall head masonry is given. In addition, gasket elements can be provided between the heating wall head and the sheet metal and/or between the sheet metal and the vertical chamber jambs. An advantageous embodiment provides that the edges of the sheet metal that are clamped between the jambs and the heating wall head that form the head cover are embedded on both sides between layers consisting of a sealing material. 
     The sheet metal forming the head cover is preferably shaped as a hood, so that a cavity is formed between the sheet metal and the heating wall head that can be filled with an insulating material, for example, mats of aluminum silicate. Advantageously, the hood has a horizontal cross section profile that is Z-shaped at the longer sides and is essentially shaped of right angles, so that a cavity forms between the hood and the heating wall head. This cavity has an essentially rectangular horizontal cross-sectional shape. In a gap between the hood and the faces of the jambs, seals can be arranged in the form of cords or packing gasket so that this gap has an essentially rectangular horizontal cross section profile. 
     The device in accordance with the invention is particularly suitable for sealing heating wall heads that consist of silicon, fire clay or sillimanite rocks. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       In the following, the invention is explained in conjunction with a drawing illustrating only one embodiment. The sole FIGURE is a schematic horizontal cross section through a portion of a heating wall head of a coke-oven battery with two adjacent coking chambers that are located right and left of a heating wall head. 
     
    
    
     DETAILED DESCRIPTION 
     The FIGURE shows the openings  1  and  1 ′ of two adjacent coking chambers and a heating wall head  2  located between them. The coking chambers are circumferentially bordered by chamber frames. The vertical jambs  5  and  5 ′ of the chamber frames define the sides of the oven chamber. A vertical post  4  that is anchored at its upper and lower ends carries spring-type biasers  6  in front of the heating wall head  2 . The biasers  6  press U-shaped yoke elements  7  against front faces of the jambs  5  and  5 ′ so as to retain the jambs  5  and  5 ′ against the heating wall head  2 . A thin piece of sheet metal  10  forming a head cover completely covering the heating-wall head  2  lies between the masonry of the heating wall head  2  and the jambs  5  and  5 ′. In the region between the jambs  5  and  5 ′ and the heating wall head  2 , the edges of the sheet-metal cover are embedded between layers  13  and  14  of a sealing material. 
     The FIGURE shows that the sheet metal forming the head cover  10  is shaped as a hood where the edges of the head cover lie in a common plane flatly against the head outer face and a planar central part of the head cover is spaced outward from the common plane and connected to the edges by unitary webs extending generally perpendicular to the common plane, so that a cavity  11  is formed between the sheet metal and a generally flat outer face of the heating wall head  2 . In horizontal cross section, the hood has a horizontal cross section profile that can be described as Z-shaped at the longer sides, formed at essentially right angles, so that the cavity  11  formed between the hood and the head wall is essentially of rectangular cross section. The cavity  11  is filled with an insulating material  12  that consists of, for example mats of aluminum silicate. A gap formed between the hood and the faces of the jambs  5  and  5 ′ and formed by the shape of the hood and the jambs  5  and  5 ′ has an essentially rectangular horizontal cross section profile, and for better sealing further seals  15  are provided in the form of cords or a packing gasket.