JP2004149749A - Oven door for heating of coke carbonization furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oven door for the heating of a coke carbonization furnace provided with a circulation separation chamber of a gas generated in the furnace to promote the heating of coal particles 2 charged to a part near the oven door of the carbonization furnace 1 and reduce the formation of tar in heating. <P>SOLUTION: The heating oven lid has a circulating and separating chamber 16 of gas generated in the oven and containing coal particle intrusion shielding rectangular members 17 arranged in longitudinal and lateral directions. The adjacent side end of the shielding rectangular member 17 of at least at the inside of the carbonization chamber is superposed in a stepped joint form of a narrow bent ventilation channel 18 to a heat-insulation box 11 placed at the inside of the furnace of the furnace door structure 3 to close the inlet port 7 of the carbonization furnace 1 through a seal plate 6 pressed against a furnace door frame 5 of the carbonization furnace 1 charged with coal particles 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention promotes the heating of coal particles charged near the inlet / outlet (or furnace lid) of the coking furnace while preventing the penetration of fine particles of the coal particles charged into the coking chamber (furnace) of the coke oven. The present invention relates to a furnace cover for raising the temperature of a coke carbonization furnace provided with a generated gas migration isolation chamber in the furnace.
[0002]
[Prior art]
The furnace lid that opens and closes the inlet and outlet of the carbonization furnace of the coke oven that produces coke is designed to withstand high-temperature heat from the production conditions where carbon particles charged into the carbonization furnace are carbonized at a high temperature of 900 ° C or more. The inside of the furnace of a sturdy steel frame structure is lined with large block-shaped refractory bricks. Moreover, where in the several years all over the world proceeds foundation of global environmental conservation, to prevent leakage of contaminated gases, such as CO and CH ₄ generated from the coal particles in the dry distillation, high furnace lid with gas sealability Has been developed and used. For example, as disclosed in Japanese Patent Publication No. 60-25072, Japanese Patent Application Laid-Open No. 2001-288472 and many other patent publications, the entrance and exit of the carbonization furnace are sealed with a heavy-weight refractory brick, and the gap around the periphery is knife-edge. Furnace lids with a closed-in-furnace structure sealed with a pressing strip having a cross section are used. A furnace lid that does not cause any problems in preserving the global environment. However, a large refractory brick of about 400 mm in thickness lined with the requirement of the heat resistance of the furnace lid structure is supplied with high-temperature heat supplied to carbonize coal particles from a heating chamber (furnace) adjacent to the carbonization furnace. Is absorbed. Due to this, there is a problem that a coke that is not sufficiently carbonized is produced from coal particles charged in the vicinity of the furnace lid of the carbonization furnace, and the coke yield is reduced. In addition, since defective coke is kiln-fired together with other carbonized coke, defective coke mixed with carbonized coke causes deterioration of coke quality.Therefore, coke must be sorted out afterwards, which has a major effect on productivity. was there.
[0003]
For the purpose of solving these problems, attempts have been made to develop a furnace lid that heats coal particles charged in the vicinity of the furnace lid of a carbonization furnace to reduce defective coke, and has been introduced in many patent publications. For example, Japanese Patent Publication No. Hei 3-40074 (filed in 1980) states, "Hot gas generated from a charge in a carbonization chamber is cooled by a heat conductive metal partition wall of at least one door in contact with the charge. Through a vertical passage in a door that separates from the interior of the door to the air duct, above the charge contacting the partition through the partition due to the rise in the gas path and the thermal conductivity of the partition. A method of transferring a portion of the hot gas to the 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, discloses a furnace in which individual shielding members in which a caulking plate is connected to the inside of a door body via a space piece are overlapped. There is a 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 that "a shield attached to the inside of a furnace wall is composed of a plurality of shields having a U-shaped cross section divided in the height direction. , A coke oven lid ", a furnace lid in which a heat-resistant packing is attached to a metal shield, Japanese Utility Model Publication No. 6-43146, and Japanese Utility Model Laid-Open Publication No. 2-69946 using ceramics for a coking plate. Hot furnace lids have been developed. In addition, as shown in FIG. 1 of Japanese Patent Publication No. 5-38995, “the gas space provided between the heat insulating material attached to the furnace lid and the heating plate provided inside the furnace, the flammability of the carbonized gas A heating type furnace lid that raises the temperature of the gas space by burning a part of the gas with air or oxygen blown from a nozzle has also been developed.
[0004]
[Problems to be solved by the invention]
In this way, by attaching a space box such as a shield or gas space through which the gas generated in the furnace passes to the furnace lid, the high temperature heat held by the conventionally generated gas in the furnace is used to make the vicinity of the furnace lid Heating the coal particles charged in the section is expected to have the effect of reducing the generation of defective coke. However, at present it is not provided for practical use.
The reason is not clear, but according to the guess of the present inventors, it is considered that the following problem has occurred. The above-mentioned shield has an extremely small number of gas vents, so that the amount of gas generated in the furnace is limited, the temperature inside the shield does not rise, and the heating temperature of coal particles near the furnace lid rises so much. Not done. The problem that muddy tar generated during carbonization flows into a narrow gas vent and solidifies and blocks it, and the work of purifying the gas vent blocked by tar must be performed in an environment with high heat. There was a problem. Furthermore, since the shield is manufactured in an assembled structure that joins metal plates by welding, it is deformed into strain under the influence of excessive thermal stress caused by thermal change repeated every time coke is discharged from the kiln, It is considered that there was a structural problem such as generation of a crack from the welded joint.
[0005]
In order to solve such a problem, the present inventors have previously developed a heating lid for a coke carbonization furnace provided with a shield independent of a welding method. In other words, strips of metal-made coal particles are shielded in parallel in the vertical and horizontal directions, and minute ventilation gaps are provided on the left and right sides of the strips. A chamber and, if necessary, a gas injection nozzle for combustion such as air or oxygen or a nozzle for injecting generated gas such as CO or C ₂ H ₂ into the furnace, are provided inside the furnace of the furnace body structure. A heating furnace lid for a coke carbonization furnace was developed, which was attached via an insulated box.
Furthermore, the present inventors have found that coal particles collide with each other when coal particles are charged into a carbonization furnace into a shielding body that does not depend on the welding method developed earlier, that is, a gas migration isolation chamber in the furnace, and generate or float. It is an object of the present invention to provide a heating lid for a coke carbonization furnace for preventing coal fines from entering and preventing tar from being generated by the coal fines in the migration isolation chamber.
[0006]
[Means for Solving the Problems]
The present invention has achieved the object, and the gist of the invention is that the inside of 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 frame of a carbonization furnace charged with coal particles is provided. A heat insulating box is provided, and a horizontal frame is further provided at a position where the furnace height direction of the heat insulating box is divided into a plurality of stages, and strip members for shielding coal particle intrusion are arranged vertically and horizontally between the upper and lower spaces of the horizontal body frame and move freely. At least the adjacent side end of the strip member for shielding and shielding of coal particles, which is lined inside the carbonization furnace, of the generated gas migration and isolation chamber which is suspended and formed in the furnace, is joined in the form of a stepped joint with a narrow bent gap path for ventilation. This is a furnace lid for heating a coke carbonization furnace.
[0007]
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. In FIG. 1, reference numeral 1 denotes a carbonization furnace of a coke oven. Reference numeral 2 denotes coal particles charged into the carbonization furnace 1. 3 is a furnace lid structure. The furnace lid structure 3 is a furnace body frame and a steel frame body frame 4 which is reinforced with a flange member at a necessary place, and is provided with a carbonization furnace through a thin seal plate 6 which presses a furnace opening frame 5 of the carbonization furnace 1. It is assembled in a structure that opens and closes one entrance 7. 8 is a bar. The bar 8 is used to fasten the steel frame body frame 4 to the entrance 7 of the carbonization furnace 1 by strongly pressing the steel frame frame 4, 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 the periphery of the seal plate 6, and a retractable pressing device 10 using a cylinder or a spring for pressing the flange member 9 against the furnace opening frame 5 is provided. Have been. That is, the furnace lid structure 3 in the present invention is provided in a structure that opens and closes the entrance 7 of the carbonization furnace 1 and fastens the same.
[0008]
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 or carbon wood, which has a high heat-insulating effect. The seal plate 6 or the in-furnace plate 13, the seal plate 6, and the slide plate It is provided on the furnace lid structure 3 via 14. That is, the heat-insulating box 11 protects the seal plate 6 from heat, prevents the heat released from the furnace lid structure 3, and removes the high-temperature heat of the gas generated in the furnace flowing through the furnace lid side of the carbonization furnace 1. This has the effect of retaining.
[0009]
Further, in the present invention, a horizontal frame made of steel or other heat-resistant metal material is provided inside the furnace of the heat insulating box 11 provided in the furnace lid structure 3 at a position where the furnace height direction of the heat insulating box 11 is divided into a plurality of stages. 15 are provided. The horizontal frame 15 is provided with an in-furnace generated gas migration isolation chamber, which will be described later, in the heat insulating box 11, and its shape is not particularly limited.
[0010]
Reference numeral 16 denotes the above-mentioned furnace generated gas migration isolation chamber. The in-furnace generated gas migration isolation chamber 16 is used to flow (migrate) the in-furnace generated gas generated in the carbonization furnace 1 at a high temperature. As shown in FIGS. 2 and 3, a plate made of steel or other heat-resistant metal is used. The strip members 17 for shielding coal particles, which are bent into a shape or a block shape or an arbitrary shape, are arranged vertically and horizontally along the peripheral surface while hanging freely on the horizontal frame 15. It is manufactured in a boxed structure with or without a wall. Also, at least the adjacent side end of the strip member 17 for shielding coal particle infiltration arranged in parallel with the inside of the carbonization furnace forming the in-furnace generated gas migration isolation chamber 16 has a stepped joint structure forming a narrow bent air gap 18 for ventilation. Are joined. Further, an exhaust port communicating with a top plate 19 or an exhaust pipe (not shown) may be provided at the upper end of the gas generation and isolation chamber 16 in the furnace, if necessary. One or two or more nozzles for blowing the reactive gas may be provided in the furnace height direction. That is, the deformation caused by the expansion of the strip member 17 for shielding coal particle intrusion, which forms the in-furnace generated gas migration and isolation chamber 16, when the strip member 17 is heated is eliminated by the escape structure that is movably suspended on the horizontal frame 15 and is adjacent thereto. As shown in FIG. 2 or FIG. 3, the fine coal particles that easily enter into the ventilation gap of the member 17 and turn into tar are formed with a step to form a narrow bent ventilation gap path 18 in which both the protruding portion and the cutout portion abut each other. It is manufactured in a structure that prevents the joint shape from joining by overlapping.
[0011]
Furthermore, in the present invention, in addition to fixing with the bolt and nut fasteners, it is easy to easily replace only the strip member 17 for shielding the coal particle intrusion that has been damaged due to some obstacle during the operation of the coke oven or during the discharge from the kiln, It may be provided in a mooring structure of a detachable mechanism that is stably suspended from the horizontal frame 15. FIG. 4 is a perspective view of an embodiment of the engagement structure, taken along a line AA in FIG. At the upper end side of the lower-side coal particle intrusion shielding strip member 17A, there are provided two hook-shaped separation hooking pieces 21 which are moored in the recesses 20 of the horizontal frame 15 having an upper surface formed into an uneven surface. The upper end of the strip member 17B for shielding coal particle intrusion and the upper end portion of the strip member 17A for shielding coal particle intrusion are cut out at the opposite lower end, that is, in the drawing, the lower end of the strip member 17B for shielding coal particle intrusion. A longitudinally extending joint structure having a stepped cross section is provided. Further, both notch protruding sides accommodate longitudinal expansion due to expansion of the strip member 17 for shielding coal particle intrusion, and are used when attaching and detaching the strip member 17. The joint structure is provided with a working space S. In other words, in the joint structure, the sliding member S of the strip member 17 is hooked and separated from the horizontal frame 15 while raising the sliding space S while pushing up the damaged coal particle intrusion shielding strip member 17 upward from below. Later, it is provided in a structure to be removed while rotating outward from below. A protrusion 22 for preventing the strip member 17 from being unnecessarily dislodged from the horizontal frame 15 due to some sort of collision is provided below the coal particle intrusion shielding strip member 17. Is provided. The shape of the projection 22 is not particularly limited as long as it is at a height at which it abuts on the lower end of the horizontal frame 15. The figure shows a projection with a rectangular cross section. In addition, 18A and 18B of FIG. 4 show one side end surface shape of the bent gap passage 18 for ventilation.
[0012]
The coke oven lid of the present invention configured as described above closes the entrance 7 of the carbonization furnace 1 with the seal plate 6 and closes the coal particles 2 after closing the entrance 7 with the seal plate 6 according to the conventional coking operation. Charge into the carbonization furnace 1. The coal particles 2 charged into the carbonization furnace 1 are gradually coke while being carbonized by high-temperature heat supplied from an adjacent heating furnace. At this time, the in-furnace generated gas having high-temperature heat generated from the coal particles 2 charged in the central portion of the carbonization furnace 1 flows toward the coal particle intrusion shielding strip member 17 side, and flows in the vicinity of the furnace lid. The charged coal particles 2 are heated and flow into the migration isolation chamber 16 while passing through the narrow ventilation gap path 18 of the furnace generated gas migration isolation chamber 16. At this time, just before the narrow ventilation gap passage 18 for ventilation, the generated gas in the furnace has a depressurizing effect to prevent the inflow of the coal fine particles mixed in the gas, and only the gas generated in the furnace flows in. The effect of significantly reducing the generation of tar in the gas migration and isolation chamber 16 in the furnace is exhibited. The in-furnace generated gas that has flowed into the in-furnace gas migration and isolation chamber 16 heats the coal particle intrusion shielding strip member 17 while migrating in the migration and isolation chamber 16 and exhausts and discharges a part of the gas. The coal particles 2 charged in the vicinity of the furnace lid via the strip members 17 are heated.
In the present invention, since the generated gas migration and isolation chamber 16 in the furnace is manufactured in an assembly structure in which the strip members 17 for shielding and shielding the coal particles are arranged in parallel through the bent gap path 18 for ventilation, the chamber 16 is inserted near the furnace lid. Rapidly heated coal particles 2. Therefore, the carbonization speed of the coal particles 2 is increased, and carbonized coke is produced at an early stage. Further, the muddy tar generated immediately before the bent bent gap path 18 of the strip member 17 for blocking coal and coal particles at low temperature also has an effect of being gasified at an early stage without being solidified while being exposed to a high temperature.
[0013]
【The invention's effect】
As described above, according to the coke oven lid of the present invention assembled from steel or other refractory metal material, the generated gas migration isolation chamber 16 in which the strip members 17 for shielding coal particle intrusion are arranged vertically and horizontally is provided. Since the structure is attached to the lid structure 3, the coal particles 2 charged near the furnace lid are rapidly heated, and even if one of the strip members 17 for shielding the penetration of coal particles is damaged, it is immediately replaced with a new member. There are operational features that can be replaced. In addition, the strip member 17 for shielding and shielding the coal particle penetration that has been damaged and replaced can be reused after straightening the damaged portion, and can be used as a resource in the steel industry. Furthermore, the generated gas migration isolation chamber 16 in the present invention is assembled into a joint structure in which a bent bent gap path 18 for blocking the inflow of coal fine particles which is liable to tar is provided on the adjacent side of the parallel strip member 17 for shielding coal particle intrusion. Because of this, there are many advantages and features, such as the necessity of frequent cleaning of the furnace lid.
[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 cross-sectional perspective view of the furnace lid structure in FIG. 1 on the carbonization furnace side.
FIG. 3 is a cross-sectional perspective view in which the carbonization furnace side of the furnace lid structure is enlarged in another embodiment of FIG.
FIG. 4 is a perspective view showing an embodiment of a joint portion of the strip member 17 for shielding coal particles from entering according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carbonization furnace 2 Coal particles 3 Furnace lid structure 5 Furnace opening frame 6 Seal plate 7 Inlet / outlet 11 Insulation box 15 Horizontal frame 16 Furnace generated gas migration isolation room 17 Strip member for shielding of coal particles 18 Bending gap for ventilation

Claims (1)

Furnace lid structure for opening / closing the entrance / exit (7) of the carbonization furnace (1) via a seal plate (6) pressed against the furnace opening frame (5) of the carbonization furnace (1) into which the coal particles (2) are charged. 3) A heat insulating box (11) is provided inside the furnace, and a horizontal frame (15) is provided at a position where the furnace height direction of the heat insulating box (11) is divided into a plurality of stages, and the horizontal frame (15) is provided. Coal particle infiltration shielding arranged in at least the inside of the carbonization furnace of the in-furnace generated gas migration isolation chamber (16) formed by vertically arranging strip-shaped plates (17) for coal particle infiltration and movably suspended between the upper and lower spaces. A heating lid for a coke carbonization furnace, characterized in that adjacent end portions of the strip member (17) are joined by a stepped joint of a narrow bent gap passage (18) for ventilation.

Images