JP3937156B2 - Coke oven lid for promoting temperature rise near the coke carbonization oven lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coke oven lid that raises the temperature of coal particles charged in the vicinity of an inlet / outlet (furnace lid) of a coke carbonization chamber (furnace) for producing coke to promote coking.
[0002]
[Prior art]
In the coke oven, the furnace lid that opens and closes the inlet / outlet of the carbonization furnace is resistant to high temperatures and high heat from the production conditions in which the coal particles charged in the carbonization furnace are carbonized at a high temperature of 900 ° C. or higher. For example, as disclosed in many patent publications such as Japanese Patent Publication No. 60-25072 and Japanese Utility Model Publication No. 5-56940, the inside of the furnace is sealed with a large weight of refractory bricks. It is a hermetically sealed structure provided with a pressing strip for sealing having a knife-edge cross section in the periphery. Indeed, it is a hearth made of a rigid steel frame structure. However, after the refractory brick with a large weight of about 400 mm absorbs the high-temperature heat supplied to dry-coal the coal particles from the heating chamber (furnace) adjacent to the carbonization furnace, especially after closing the furnace lid It absorbs a lot of heat in during heating. For this reason, the coal particles charged in the entrance / exit side of the carbonization furnace, that is, the vicinity of the furnace lid, are not obtained with sufficient carbonization temperature and carbonization time, and are mixed into other carbonization coke while remaining in poor coke, and are discharged from the kiln. There is a problem that has a great influence on productivity, such as the coke sorting operation that causes the quality deterioration of the coke.
[0003]
In order to solve such problems, many attempts have been made to develop a coarse carbonization furnace lid that improves the thermal efficiency in the carbonization furnace, and there are many patents behind. For example, Japanese Examined Patent Publication No. 3-40074 (filed in 1980) states that "the hot gas generated from the charge is separated from the inside of the carbonization chamber by a thermally conductive metal partition wall of at least one door in contact with the charge. through the vertical passage in the door to separate feed into the flue, the thermal conductivity of the rise and the partition wall in a passage of the gas, the upper side end region of the charge in contact with the partition wall through the partition wall A method of coking the charge by transferring part of the heat of the gas is disclosed. Based on this method, Japanese Examined Patent Publication No. 61-49353 (filed in 1982) stated that “gas generated in the furnace in which individual shielding members combined with caulking plates via spacer pieces were provided inside the furnace in an overlapping manner. “Coke oven equipped with a passage shield”, Japanese Patent Application Laid-Open No. Sho 62-72782 (filed in 1985) “The shield is divided into a plurality of shields having a U-shaped section divided in the height direction. Coke oven cover made up of a body ", Japanese Utility Model Publication No. 6-43146," Metal gas passage shields with heat resistant and flexible packings on both sides facing the coke oven wall ""Coke oven cover", Japanese Patent No. 2894065 discloses "Coke in which the inner surface of the metal gas passage component in contact with the charged coal is coated with a heat insulating material that protects it from contact with a gas having a large temperature difference. Furnace hearth " For example, “Caikaihei 2-69946” uses ceramics having a thickness of 25 mm or less for the caulking plate constituting the gas passage, and “Caikaihei” uses cordierite composite ceramics containing zinc oxide or alumina fibers. Patent No. 3-18150 discloses many structures and techniques of applied materials.
[0004]
[Problems to be solved by the invention]
Thus, 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 having high temperature heat is reduced as compared with the previous furnace lid. However, the current situation is that it has not been put into practical use.
The reason for this is not clear, but according to the estimations of the present inventors, it is considered that there were the following problems. As in Japanese Utility Model Laid-Open No. 1-174736, in a carbonization furnace in which a shield for allowing the gas generated in the furnace to pass is provided inside the furnace of the heat insulating plate and a refractory brick lining is applied to the inside of the furnace, the gas generated in the furnace is high. Although the retained heat is consumed effectively, the heat absorption amount of the refractory brick is still large, so the heating temperature of the coal particles charged in the vicinity of the furnace lid does not rise, and there is a problem that defective coke is produced . Furthermore, problems refractory bricks during opening and closing operations of the furnace lid is peeled part collides with something, it is believed that debris exfoliated refractory brick had mixed Zari writing problems coke.
[0005]
In addition, in a shield with a small gas vent, such as the above-mentioned Japanese Patent Publication No. 3-40074, the amount of gas in the furnace is suppressed, so the temperature inside the shield is low, and the coal particles in the vicinity of the furnace lid There is a problem that the heating temperature is not so increased. In addition, since the shield is made of a wide metal plate shielding member, the influence of the great thermal stress when the shielding member is rapidly cooled (shrinked) from a high temperature (expanded) repeated every time the coke is taken out. In response to this, there is a problem that the gas is deformed into a strain and the gas vent is blocked or further narrowed. In addition, mud tar generated during dry distillation flows into the vent and solidifies and closes, and the opening and cleaning work of the vent that is blocked by deformation and close contact with the tar is in an environment with high heat. It is thought that there are many problems that need to be solved in the future, such as problems that must be done briefly.
[0006]
As a result of searching for the problem of the reason why the shield developed so far as described above is not used as described above, and further repeating experiments and examinations for the purpose of eliminating the problem, the present inventors A carbonization furnace for a coke oven lid with a gas recycle isolation chamber in the furnace having a structure in which a small ventilation gap is provided on the left and right sides of the adjacent shielding strip members and the shielding walls are arranged vertically and horizontally as shielding walls. By installing it in the side of the furnace lid, when a large amount of the gas generated in the carbonization furnace that has generated high-temperature heat flows through the coal particles to the floating isolation chamber, The charged coal particles are heated directly. In addition, the high temperature gas generated in the furnace is introduced into the furnace gas separation chamber by passing through the small ventilation gaps on the left and right sides of the shielding strip without any flow restriction. The heat in the room raised to a high temperature indirectly heats the coal particles near the furnace lid through the shielding wall. In other words, the present inventors improved the coke oven lid structure of the heating method in which the coal particles charged in the vicinity of the furnace lid are sandwiched by heat from both the inside of the furnace and the side of the furnace lid. It has been found that coking of coal particles is promoted and at the same time tar generation and adhesion are remarkably suppressed.
[0007]
[Means for Solving the Problems]
The present invention is configured on the basis of this finding, and the gist of the present invention is through a seal plate in which a flange member having a knife edge cross-sectional shape that presses the furnace opening frame of a carbonization furnace charged with coal particles is joined to the peripheral portion. A heat insulating box is provided inside the furnace of the furnace lid structure that opens and closes the entrance and exit of the carbonization furnace, and further, a spacing horizontal body frame is provided at a position where the furnace height direction of the heat insulating box is divided into a plurality of stages. Coal particle intrusion shielding strips are arranged vertically and horizontally between vertical and horizontal gaps, and the upper ends of the coal particle intrusion shielding strips are suspended so as to be freely slidable from the gap horizontal frame. coal particles entering the the shielding strip plate shielding wall insulation box (11) bottomless furnace gas generated migratory isolation chamber structure (15) the temperature increase promotion coke coke carbonization furnace lid part near that attaching a surrounded by It is a furnace lid.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention in a sectional view in the furnace height direction. FIG. 2 shows an enlarged perspective view with a part omitted of the cross section taken along the line AA of FIG. In the figure, 1 is a carbonizing furnace of a coke oven. Reference numeral 2 denotes coal particles charged into the carbonization furnace 1. 3 is a furnace lid structure which opens and closes the entrance / exit 4 of the carbonization furnace 1. The furnace lid structure 3 is provided with a thin seal plate 7 that presses the furnace port frame 6 of the carbonization furnace 1 to the carbonization furnace side of a steel frame frame 5 reinforced with flange members at the frame frame and other necessary portions. Thus, it is assembled in a structure that opens and closes the entrance / exit 4 of the carbonization furnace 1. 8 is a scissors, which strongly presses and fastens the steel frame 5 to the inlet / outlet 4 of the carbonization furnace 1 and is configured by combining fastening members such as compression springs and screw bolts. In addition, a flange member 9 having a knife edge cross-sectional shape (tapered cross-sectional shape) is joined to the peripheral portion of the seal plate 7 and can be moved forward and backward using a cylinder or a spring that presses the flange member 9 against the furnace port frame 6. A pressing jig 10 is provided. That is, the furnace lid structure 3 in the present invention closes the entrance / exit 4 of the carbonization furnace 1 via the seal plate 7 that seals the inside of the carbonization furnace 1 while pressing the furnace port frame 6 of the carbonization furnace 1, and It is provided in a structure that opens and closes the entrance / exit 4 by an advance / retreat driving operation of the structure 3.
[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 having a high heat insulating effect such as alumina silicate, isolites, carbon wood, ceramic material, etc. It is provided in the furnace lid structure 3 via the body 3 and via the furnace plate 13 and the seal plate 7 or further the slide plate 14. The figure shows an embodiment in which the heat insulating box 11 is attached to the furnace lid structure 3 via a furnace plate 13, a seal plate 7, and a slide plate 14 with a bolt joint (not shown). That is, the heat insulation box 11 protects the seal plate 7 from heat, prevents heat released to the furnace lid structure 3 and releases it, and the generated gas in the furnace circulating in the furnace lid side of the carbonization furnace 1 has a high temperature. This has the effect of maintaining the heat.
[0010]
Furthermore, in the present invention, a gas having high-temperature heat generated in the carbonization furnace 1 through the heat insulating box 11 is circulated (moved) through the inside of the furnace lid structure 3 assembled in the above-described structure. the furnace gas generated migratory isolation chamber 15 of a bottomless structure is provided for. The bottomless gas generating and isolating chamber 15 is processed or assembled into a hollow frame member of a holding shape such as a bag shape or a cylindrical shape or an arbitrary shape at a position where the furnace height direction is divided into a plurality of stages. A spacing horizontal body frame 16 made of heat-resistant steel or other heat-resistant metal material that does not deform into the pressing force of the particles 2 or other external pressure is attached to the heat insulating box 11, and the spacing horizontal body frame 16 is Coal particle ingress shielding strips 17 made of the same material are juxtaposed in a grid-like arrangement as shown in the figure with minute ventilation gaps 18 on the left and right, or in an intermittent arrangement alternately above and below, and a coke kiln. In order to prevent the deformation of the strip 17 for shielding the coal particle intrusion due to the characteristics of the metal that occurs inevitably when it is cooled from a high temperature to a low temperature repeated every time it is taken out, the coal particle intrusion shielding is prevented. Short for Via bolts or other engaging member 19 the upper end to the spacing transverse body frame 16 of the plate 17 is swingably suspended without restraining the lower end. In the present invention, when the coal particle intrusion shielding strips 17 are juxtaposed in the vertical and horizontal directions, it is preferable to provide a gap corresponding to the expansion allowance of the plate between the upper and lower sides in the vertical direction. However, it is preferable that the strip plate is provided in consideration of the expansion allowance and the size that the coal particles 2 do not enter. Further, if necessary, an exhaust pipe for the in-furnace generated gas may be provided in the bottomless gas generating and isolating chamber 15 so that the in-furnace generated gas smoothly flows in and flows. That is, the bottomless gas generating and isolating chamber 15 of the bottomless structure according to the present invention is defined by the shielding wall of the intrusion shielding strip 17 and the heat insulation box (11) suspended from the space frame 16 so as to be freely movable. in furnace gas flow chamber of the enclosed space, the furnace the gas flow chamber from minute ventilation gap 18 of coal particles entering the shielding strip plate 17 furnace generating the gas flowing through the carbonization furnace 1 is adjacent to the left and right After entering and migrating, it is provided in a structure that flows out from another ventilation gap 18 to the carbonization furnace 1 or to the exhaust pipe.
[0011]
The coke oven lid of the present invention configured as described above is similar to the conventional coking operation. After the inlet / outlet 4 of the carbonization furnace 1 is closed with the seal plate 7 and sealed with the furnace lid structure 3, the coal particles 2 is charged into the carbonization furnace 1. The coal particles 2 charged in the carbonization furnace 1 gradually coke while being carbonized with high-temperature heat supplied from an adjacent heating furnace . At this time, the high-temperature in-furnace gas generated from the coal particles 2 charged in the center of the carbonization furnace 1 flows to the coal particle intrusion shielding strip 17 and the coal particles 2 that have not reached the dry distillation temperature. As the temperature rises and the temperature rises, the gas flows from the minute ventilation gap 18 of the coal particle intrusion shielding strip 17 into the gas-separated separation chamber 15 generated in the bottomless structure. Coal furnace gas generated migratory isolation chamber 15 of a bottomless structure is heated in flowing furnace gas generated in high temperature, through the coal particles entering the shielding strip plate 17, which is charged to the furnace roof vicinity Particle 2 is heated. The coal particles 2 charged in the vicinity of the furnace lid in this way are heated when the in-furnace generated gas flows from the central part of the carbonization furnace 1 to the in-furnace generated gas recirculation separation chamber 15 having a bottom structure. It is heated by the heat released from the coal particle intrusion shielding strip 17 in the isolation chamber heated to the temperature. That is, the present invention is, because it is composed of coal particles 2 are charged into the furnace lid vicinity of both the furnace interior and furnace lid side to the furnace cover structure heating system sandwiching a thermal, furnace roof vicinity of coal It promotes the dry distillation of the particles 2 and follows the coal particles charged in the center of the carbonization furnace 1 to reach the coking temperature at an early stage. Further, the mud tar generated in the low temperature region is gasified without solidifying, or is naturally discharged to the outside from the bottom of the in-furnace generated gas recirculation and separation chamber 15.
[0012]
【The invention's effect】
As described above, the coke oven lid according to the present invention in which the gas generation isolation chamber in the furnace in which the strip for shielding the coal particle intrusion is suspended is provided inside the furnace lid structure is inserted in the vicinity of the furnace lid. Since the heated coal particles are heated to follow the heating rate of the coal particles charged in the central portion of the carbonization furnace, the generation of defective coke is remarkably reduced, and coke with uniform quality is produced. Further, since tar generated in a low temperature region during dry distillation is naturally discharged, the tar cleaning work for each coke removal is remarkably reduced, and the cleaning time is shortened. Further, in the present invention, the bottomless gas generating and isolating chamber in the furnace is constructed in such a manner that the coal particle intrusion shielding strips are arranged vertically and horizontally and are detachable, so that the severely damaged isolation chamber portion Can be repaired by simply replacing the strip, and even when tar closes the ventilation gap, it can be restored by lightly rubbing the surface of the strip. Furthermore, because heat-resistant metal plates are used for the coal particle intrusion shielding strips, they can be reused by cutting some damaged parts, and even if they become replacement waste disposal materials, they are used as resources in the steel industry. There is also a feature.
[Brief description of the drawings]
FIG. 1 is a sectional view in the furnace height direction according to an embodiment of the present invention.
2 is a partially omitted enlarged perspective view of a cross section taken along line AA of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carbonization furnace 2 Coal particle 3 Furnace structure 4 Entrance / exit 6 Furnace frame 7 Seal plate 11 Heat insulation box 15 Gas circulation isolation chamber 16 Space | interval horizontal body frame 17 Coal particle intrusion shielding strip 18 Ventilation clearance

Claims (1)

Carbonization furnace through a seal plate (7) joined to the peripheral edge of a flange member (9) having a knife edge cross-sectional shape that presses the furnace port frame (6) of the carbonization furnace (1) charged with coal particles (2). A heat insulation box (11) is provided inside the furnace of the furnace lid structure (3) that opens and closes the entrance / exit (4) of (1), and further, the furnace height direction of the heat insulation box (11) is spaced at a position where it is divided into a plurality of stages. A horizontal frame (16) is provided, and a strip (17) for shielding and intruding coal particles is provided in the vertical and horizontal directions with minute ventilation gaps (18) on the left and right sides between the vertical spaces of the horizontal frame (16). In addition, the upper end of the coal particle intrusion shielding strip (17 ) is surrounded by a coal particle intrusion shielding strip shielding wall suspended in a freely movable manner on the interval horizontal frame (16) and the heat insulating box (11). be characterized in that annexed furnace gas generated migratory isolation chamber of a bottomless structure (15) which Coke oven lid promotes Atsushi Nobori of the coke carbonization furnace lid vicinity.

Images