JP2004018853A - Coke oven cover for accelerating temperature rise near coke carbonization oven cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coke oven cover that promotes the coking of coal particles fed into the section near the cover of a coke carbonization oven. <P>SOLUTION: The coke oven cover is constructed by providing, inside a coke oven cover structure 3 that opens/closes the entrance 4 of a coke carbonization oven 1, a heat-insulating box 11 and a bottomless emitted gas circulation and isolation chamber 15 formed by providing a plurality of stages of lateral spacer frames 16 beside the box 11, laterally juxtaposing coal particle infiltration block strip plates 17, which are freely movably suspended from the frames 16, on the frames 16 so as to leave small aerating gaps 18 on both sides of each plate 17, and superposing the lower end of each upper plate 17A and the upper end of the lower plate 17B in such a manner that they are slidable on a notched cross section and that a coupling notch groove 20 that directs the oven cover side is provided on one side of the superposed face, and a coupling protrusion 21 which is freely coupled with the groove 20 is formed on the other side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a coke oven lid for raising the temperature of coal particles charged near an entrance / exit (furnace lid) of a coking chamber (furnace) of a coke oven for producing coke and promoting coking.
[0002]
[Prior art]
In the coke oven, the furnace lid that opens and closes the entrance and exit of the carbonization furnace has a high sealing property and can withstand high heat due to the coke production conditions in which coal particles charged in the carbonization furnace are carbonized at a high temperature of 900 ° C or higher. Structures are required. For example, as disclosed in many patent publications such as Japanese Patent Publication No. 60-25072 and Japanese Unexamined Utility Model Publication No. 5-56940, the entrance and exit of the carbonization furnace are sealed with a refractory brick having a large weight, and the periphery thereof is shaped like a knife edge. There is a hermetic structure that is sealed with a pressing strip having a cross section. The furnace lid is made of a rigid steel frame structure. However, refractory bricks having a large weight of about 400 mm absorb high-temperature heat supplied to carbonize coal particles from a heating chamber (furnace) adjacent to a carbonization furnace, and then take out coke (furnace). After the next coal particles are charged, the entrance and exit are closed and a considerable amount of heat is absorbed when the temperature rise is started. For this reason, the coal particles charged in the entrance and exit of the carbonization furnace, that is, in the vicinity of the furnace lid, are kiln discharged together with other carbonized coke as defective coke, which does not have sufficient carbonization temperature and carbonization time, and the coke yield Come down. Furthermore, there is a problem that productivity is greatly affected, such as the necessity of performing coke sorting work due to the cause of poor coke quality deterioration of carbonized coke.
[0003]
For the purpose of solving such a problem, many attempts have been made to develop a coke carbonization furnace lid for improving the thermal efficiency in the carbonization furnace, and there are many patent publications. For example, Japanese Patent Publication No. Hei 3-40074 (filed in 1980) states that "hot gas generated from a charge in a carbonization chamber is carbonized by a heat conductive metal partition wall of at least one door in contact with the charge. Through the vertical passage in the door that separates from the interior of the chamber to the air supply line, the rise of the gas in the passage and the thermal conductivity of the partition, through which the charge comes into contact with the partition through the partition. A method of transferring a portion of the heat of the gas to the upper end region to coke the charge "is disclosed. Japanese Patent Publication No. 61-49353 (filed in 1982), which has been developed based on this method, describes a furnace having a plurality of shielding members each having a caulking plate connected to the inside of the furnace via a spacer piece. Coke oven lid with a shield for the passage of internally generated gas. Further, Japanese Patent Application Laid-Open No. 62-72782 (filed in 1985) states, "A coke oven furnace lid in which a shielding body is constituted by a plurality of shielding plates having a U-shaped cross section divided in the height direction." Japanese Utility Model Publication No. 6-43146 discloses "a furnace lid for a coke oven in which heat-resistant and flexible packing is attached to both sides of a metal gas passage shield facing the coke oven wall", and Japanese Patent No. 2894065. `` The coke oven lid, in which the inner surface of the metal gas passage component contacting the charged coal is covered with a heat insulating material to protect it from contact with gas having a large temperature difference, '' Japanese Unexamined Utility Model Publication No. Hei 2-69946, in which a ceramic having a thickness of 25 mm or less is used for a coking plate, and a real ceramic in which a cordierite composite ceramic containing zinc oxide or alumina fiber is used. Such as flat 3-18150 discloses "a number of coke oven cover structure disclosed by patent publications.
[0004]
[Problems to be solved by the invention]
In this way, with the advent of the space box type shield technology that allows the gas generated in the furnace to pass through, the heat loss of the gas generated in the furnace, which retains high-temperature heat, has been significantly reduced as compared to previous furnace lids. . However, at present it is not provided for practical use. Although the reason is not clear, the present inventors have guessed that the following problems are considered. As disclosed in Japanese Utility Model Laid-Open No. 1-147236, "a carbonization furnace in which a shield for passing gas generated in the furnace is provided inside the furnace of the heat insulating plate and a refractory brick is lined inside the furnace" Although high retained heat is used effectively, the heat absorption of refractory bricks is still large, and the heating temperature of coal particles charged near the furnace lid does not rise, resulting in the production of defective coke. There is. Further, it is considered that there is a problem that the refractory brick collides with something and peels off part of the refractory brick during the opening / closing operation of the furnace lid, and a problem that fragments of the refractory brick are mixed with coke.
[0005]
Further, in a shield having a small gas vent as in the above-mentioned Japanese Patent Publication No. Hei 3-40074, the flow rate of gas generated in the furnace is limited. There is a problem that the heating temperature of the particles is not so increased. In addition, since the shield is made of a wide metal plate shield, the effect of excessive thermal stress when the shield is rapidly cooled (shrinked) from a high temperature (expansion) repeated every time the coke is discharged from the kiln. There is a problem in that the gas vent is deformed and deformed, and the gas vent is closed or narrowed by ten layers. In addition, the problem of the muddy tar generated during carbonization flowing into the vent and solidifying and blocking it, deformation and opening and purifying of the blocked vent due to close contact of the tar in an environment with high heat It is thought that there are many problems that need to be solved, such as problems that need to be solved quickly.
[0006]
The present inventors have searched for reasons and problems that the shields developed so far have not been used as described above and have conducted experiments and studies with the aim of providing a coke oven lid that has solved the problems. As a result of the stacking, carbonization is achieved by installing a gas generation and isolation chamber inside the furnace with a structure in which metal shielding strip members are provided with minute ventilation gaps on the left and right and arranged vertically and horizontally as shielding walls, on the carbonization furnace side. When the gas generated in the furnace having high-temperature heat generated in the furnace flows between the coal particles and flows into the gas migration isolation chamber, it heats the coal particles charged near the furnace lid. In addition, the high-temperature gas generated in the furnace flows through the minute ventilation gaps provided on the left and right sides of the shielding strip without any flow control, and the temperature of the generated gas migration and isolation chamber in the furnace is raised to a high temperature. Then, it was found that the high temperature of the gas migration chamber indirectly heated the coal particles near the furnace lid through the shielding wall. Furthermore, in order to maintain the function of the gas generation and isolation chamber in the furnace for a long period of time, the upper and lower ends of the shielding strip members are arranged in order to avoid a shape change caused by expansion of the shielding strip members arranged in the vertical direction. Parts are slidably overlapped with each other, and partial deformation of the shielding strip member due to uneven thermal stress (tensile stress and shrinkage stress) caused by uneven pressing force and heating temperature difference of charged coal. It has been found that it is necessary to provide the upper and lower ends of the overlapping side of the shielding strip member in an engaged state in order to prevent swinging.
[0007]
[Means for Solving the Problems]
The gist of the present invention is based on these findings, and the gist of the present invention is to provide a furnace lid structure that opens and closes the entrance and exit of a carbonization furnace through a seal plate that presses against a furnace opening frame of a carbonization furnace into which coal particles are charged. Inside the furnace, a heat insulating box is provided, and furthermore, a horizontal frame is provided at a position where the furnace height direction of the heat insulating box is divided into a plurality of stages, and a strip plate for coal particle infiltration shielding is provided between the vertical spaces of the horizontal frame. Are arranged vertically and horizontally with a small ventilation gap on the left and right, and the upper end of the strip for coal particle infiltration shielding is hangably movably suspended in the horizontal space frame. The joint between the lower end of the plate and the upper end of the lower side of the strip for coal particle infiltration shielding overlaps slidably in a cut-out cross-sectional shape, and on one side of the joining surface that overlaps, is a joint pointing toward the furnace lid. A notch groove for fitting is provided on the other side. Jo was a bottomless oven generated coke oven cover for promoting Atsushi Nobori of the gas migration isolation chamber constructed by attaching the coke carbonization furnace lid vicinity of the structure provided with.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view in a furnace height direction according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view in which a part of a cross section taken along line ZZ of FIG. 1 is omitted. 1 and 2, reference numeral 1 denotes a carbonization furnace of a coke oven. Reference numeral 2 denotes coal particles charged into the carbonization furnace 1. Reference numeral 3 denotes a furnace lid structure for opening and closing the entrance 4 of the carbonization furnace 1. The furnace lid structure 3 is provided with a thin seal plate 7 for pressing the furnace opening frame 6 of the carbonization furnace 1 on the carbonization furnace side of the steel frame frame 5 reinforced with a flange member on the furnace body frame and other necessary parts. It is assembled in a structure that opens and closes the entrance 4 of the carbonization furnace 1 through the intermediary. Reference numeral 8 denotes a bar, which strongly presses the steel frame 5 against the entrance 4 of the carbonization furnace 1 to fasten the steel frame 5, and is constituted by combining fastening members such as compression springs and screw bolts. A flange member 9 having a knife-edge cross-sectional shape is joined to a peripheral portion of the seal plate 7, and a retractable pressing jig 10 using a cylinder, a spring, or the like that presses the flange member 9 is provided. That is, the furnace lid structure 3 in the present invention is provided in a structure that closes the entrance 4 of the carbonization furnace 1 and opens and closes the entrance 4 by the furnace lid structure 3 advance / retreat driving operation.
[0009]
11 is a heat insulation box. The heat-insulating box 11 is a metal heat-resistant box 12 filled with a generally used fire-resistant heat-insulating material such as alumina silicate, isolites, carbon wood, and ceramics, which has a high heat-insulating effect. The furnace body structure 3 is provided on the body 3 and via the furnace inner plate 13 and the seal plate 7 or further through the slide plate 14. FIG. 2 shows an embodiment in which the heat insulating box 11 is attached to the furnace body structure 3 via a furnace inner plate 13, a seal plate 7, and a slide plate 14 by a bolt joint (not shown). That is, the heat-insulating box 11 protects the seal plate 7 from heat, prevents heat transmitted to the furnace body structure 3 and releases the heat, and generates a high-temperature gas in the furnace circulating on the furnace lid side of the carbonization furnace 1. This has the effect of maintaining the heat.
[0010]
Further, in the present invention, a furnace having a bottomless structure in which high-temperature generated gas generated in the carbonization furnace 1 flows (migrates) inside the furnace structure 3 assembled in the above-described structure. A generated gas migration isolation chamber 15 is provided.
The generated gas migration isolation chamber 15 having a bottomless structure is processed and assembled into a holding shape such as a bag shape or a cylindrical shape or a hollow frame member having an arbitrary shape at a position where the furnace height direction is divided into a plurality of stages. A space horizontal frame 16 made of heat-resistant steel or other heat-resistant metal material which is not deformed by the pressing force of the input coal 2 and other external pressures is attached to the heat insulating box 11, and the same is applied to the space horizontal frame 16. A small ventilation gap 18 is provided on the left and right sides of the coal particle invasion shielding strip 17 made of the above material, and they are arranged vertically and horizontally, and the upper side of the shielding strip 17 is provided with bolts and other engaging members 19. It is suspended so that it can swing. Further, as shown in the perspective view of FIG. 3 and the perspective perspective view of FIG. The joining side of the lower end of 17A and the upper end of the lower-stage strip 17B for coal particle infiltration is slidably overlapped with a cutaway cross-section, and one side of the joining surface is directed toward the furnace lid. A joint cut groove 20 is provided, and a joint protrusion 21 that fits loosely into the joint cut groove 20 is provided on the other side. That is, in the present invention, by joining the joining sides of the strips 17A and 17B for shielding coal particle intrusion into a joining surface having a notched cross-sectional shape, a so-called stepped joint shape, the joint portion has a vertical shape without swelling. The sliding required to prevent damage and deformation of the shielding strips caused by the drop impact of the coal 2 and the carbonized coke that have been joined and to escape the expansion of the shielding strips themselves above and below the joining surface. By providing the sliding space S having a length, the effect of maintaining the shape of the shielded strip plate and extending the shape of the in-furnace gas migration and isolation chamber 15 having a bottomless structure over a long period of time is exerted. Regarding the notched cross-sectional shape of the joining surface, a notched cross-sectional shape having a gentle slope partly as in the shielding strip 17A or a rectangular notched cross-section as in the shielding strip 17B may be used. The cut-out cross-sectional shapes may be exchanged, or the cut-out cross-sectional shape may be the same as the top and bottom, or may be a thin cross-sectional shape of any other shape. Further, the joint cut groove 20 and the joint protrusion 21 are formed by the coal particle intrusion shielding plate 17 suspended vertically under the influence of the pressing force of the charged coal 2 and the deformation stress of the structural member. It prevents torsion and rolling, and keeps the shape of the generated gas migration and isolation chamber 15 having a bottomless structure so as not to impair the shape thereof. The shielding strip 17 is restrained and secured at a predetermined position. As long as it has an engaging function, any engaging shape such as a triangular cross-sectional shape, a polygonal cross-sectional shape, or a cylindrical cross-sectional shape may be used in addition to the rectangular cross-sectional shape as illustrated.
[0011]
In the present invention, it is preferable that the ventilation gaps 18 of the coal particle intrusion shielding strips 17 arranged vertically and horizontally are provided in consideration of a size such that the coal particles 2 do not enter. If necessary, an exhaust pipe for the gas generated in the furnace may be provided on the upper side of the furnace-isolated gas migration chamber 15 having a bottomless structure so that the gas generated in the furnace flows smoothly and easily migrates. . That is, the in-furnace generated gas migration and isolation chamber 15 having a bottomless structure flows the in-furnace generated gas flowing in the carbonization furnace 1 through the minute ventilation gaps 18 on the left and right sides of the strip 17 for shielding coal particle intrusion. After being circulated, it is provided to flow out from another ventilation gap 18 to the carbonization furnace 1 or the exhaust pipe.
[0012]
The coke oven lid of the present invention configured as described above, as in the conventional coking operation, closes the inlet / outlet 4 of the carbonization furnace 1 with the seal plate 7 and closes it with the furnace lid structure 3 and then removes the coal particles. 2 is charged into the carbonization furnace 1. The coal particles 2 charged in the carbonization furnace 1 are gradually transformed into coke while being carbonized by high-temperature heat supplied from an adjacent heating furnace. At this time, the high-temperature in-furnace generated gas generated from the coal particles 2 charged in the central part of the carbonization furnace 1 flows toward the coal particle intrusion shielding strip 17 side while the low-temperature generated gas near the furnace lid. While heating the coal particles 2, the gas flows into the furnace gas migration isolation chamber 15 having a bottomless structure from the minute ventilation gap 18 of the strip 17 for shielding coal particles from entering. The in-furnace gas quarantine chamber 15 having a bottomless structure heated to a high temperature by the flow of the generated gas in the furnace heats the coal particles 2 in the vicinity of the furnace lid via the strip 17 for shielding coal particles from entering. . The coal particles 2 charged in the vicinity of the furnace lid are heated when the gas generated in the furnace flows from the central part of the carbonization furnace 1 to the gas generation and isolation chamber 15 having a bottomless structure, and the coal particles 2 are heated. It is heated by the heat released from the coal particle intrusion shielding strip 17 of the isolation chamber 15 heated to the temperature. That is, the present invention is configured in a heating type lid structure in which the coal particles 2 charged in the vicinity of the furnace lid are sandwiched by heat from both directions inside the furnace and on the side of the furnace lid. 2 to promote the carbonization and follow the coal particles at the center of the carbonization furnace 1 to reach the coking temperature early. The muddy tar generated in the low temperature region is gasified without coagulation, or is naturally discharged to the outside from the bottom of the in-furnace generated gas migration isolation chamber 15 having a bottomless structure.
[0013]
As described above, the coke oven lid of the present invention in which the in-furnace generated gas migration isolation chamber in which the strip for coal particle infiltration shielding is suspended is provided inside the furnace lid structure, Since the temperature of the coal particles is increased in accordance with the heating rate of the coal particles charged in the central part of the carbonization furnace, the generation of defective coke is significantly reduced, and coke of uniform quality is produced. In addition, since tar generated in a low-temperature region during carbonization is naturally discharged, the cleaning operation of tar for each removal of coke is significantly reduced, and the cleaning operation is also shortened. Further, the present invention is manufactured so that the generated gas migration and isolation chambers of the bottomless structure are arranged so that the strip plates for shielding coal particle intrusion are arranged vertically and horizontally, and each can be replaced by a detachable mechanism. Therefore, in the severely damaged isolation room, the shielding strip can be repaired by simply replacing it, and even when tar blocks the ventilation gap, the tar can be rubbed lightly by rubbing the surface of the shielding strip. Can be removed. Further, the present invention provides a bottomless structure because the upper and lower tiers of coal particle infiltration shielding strips are joined by a slidable superposed structure utilizing an engagement joint mechanism and escaping the expansion of the shielding strips. There is a feature that the shape of the generated gas migration isolation chamber in the furnace can be maintained for a long period of time. Furthermore, since the heat-resistant metal plate is used for the strip for shielding the coal particles from entering, it is reused by cutting the damaged part, and it is used as a replacement waste material and reused as a resource in the steel industry. There is also.
[Brief description of the drawings]
FIG. 1 is a sectional view in a furnace height direction according to an embodiment of the present invention.
FIG. 2 is an enlarged perspective view in which a part of a cross section taken along line ZZ of FIG. 1 is omitted.
FIG. 3 is a perspective view of a joint portion of strip plates 17 for shielding coal particle intrusion arranged vertically.
FIG. 4 is a partially transparent perspective view of a joint portion of the strip 17 for shielding coal particle intrusion arranged vertically.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carbonization furnace 2 Coal particle 3 Furnace lid structure 4 Doorway 6 Furnace opening frame 7 Seal plate 11 Insulation box 15 Furnace generated gas migration isolation room 16 Interval horizontal frame 17 Strip plate for coal particle penetration shielding 18 Ventilation gap 20 Joint Notch 21 for joint Protrusion S for sliding space

Claims (1)

Furnace lid structure for opening / closing the entrance / exit (4) of the carbonization furnace (1) through a seal plate (7) pressed against the furnace opening frame (6) of the carbonization furnace (1) into which the coal particles (2) are charged. A heat insulation box (11) is provided inside the furnace of (3), and a space horizontal frame (16) is provided at a position where the furnace height direction of the heat insulation box (11) is divided into a plurality of stages. At the upper and lower spaces of (16), strip plates (17) for shielding coal particle intrusion are arranged vertically and horizontally with a small gap (18) for ventilation on the left and right and above the strip plate (17) for shielding coal particle penetration. The ends are movably suspended from the spacing horizontal frame (16), and further above the lower end of the upper-stage coal particle penetration shielding strip (17A) and the lower-stage coal particle penetration shielding strip (17B). The joint side of the end is slidably overlapped with a notched cross-sectional shape, and one side of the overlapped joint surface is to the furnace lid side A gas flow in a furnace having a bottomless structure in which a notch groove (20) for a joint is provided and a protrusion (21) for a joint which is loosely fitted in the notch groove (20) is provided on the other side. A coke oven lid for accelerating temperature rise in the vicinity of a coke carbonization oven lid, wherein the isolation chamber (15) is accommodated therein.

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