JP2006083359A - Lid of temperature-rising type coke oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coke oven lid installed with an oven gas-distribution box for increasing the temperature-rising rate of coal particles charged in the vicinity of the carbonizing oven lid and also excellent in heat resistance. <P>SOLUTION: This temperature-rising type coke oven lid is provided by stacking and lining an earthy graphite-coated film 17, a heat resistant packing sheet 18 and a heat resistant metal sheet 19 on a heat insulation box 12 installed at the inside of the oven of the oven lid structural body 3 for pushing/pressing an oven opening frame 4 of the carbonizing oven 1 charged with coal particles 2, and installing an air-ventilating gap 16 at the outermost layer of them to install the oven gas-distribution box 13. Further, the temperature-rising type coke oven lid is provided by installing an air-blowing nozzle 21 having an air-supplying valve 20 at the outside of the oven of the oven lid structural body 3, on the oven gas-distribution box 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature rising type coke door (furnace lid) that promotes coking of coal particles charged in the vicinity of an entrance (or furnace lid) of a coke carbonization chamber (furnace) for producing coke. is there.

Technical background

  The coke oven lid that opens and closes the inlet / outlet of the carbonizing furnace of the coke oven is disclosed in Japanese Utility Model Laid-Open No. 5-56940 and Japanese Patent Application Laid-Open No. 5-56940 or JP As introduced in many patent publications such as 2001-288472, the entrance / exit of the carbonization furnace has a thickness of about 400 mm through a seal plate having a knife-edge cross-sectional shape in contact with the furnace port frame (door jam) of the carbonization furnace. It is assembled in a sealed, sturdy steel furnace lid structure sealed with heavy refractory bricks. However, due to the problem that the heavy refractory bricks absorb the high temperature heat supplied to dry coal particles from the heating chambers (furnace) adjacent to both sides of the carbonization furnace, The coal particles charged in the vicinity produce defective coke in which sufficient carbonization temperature and carbonization time cannot be obtained, and are taken out together with other carbonization coke (kneading out), resulting in a reduction in coke yield. In addition, defective coke mixed with dry-distilled coke causes deterioration of coke quality, and therefore, there is a problem that greatly affects productivity, such as further coke sorting work to remove defective coke.

  For the purpose of solving such a problem, for example, as introduced in Japanese Patent Publication No. 3-40074, “a high-temperature gas generated from a charge is heated to heat of at least one door in contact with the charge. A conductive metal partition wall is sent to the air pipe through a vertical passage in the door separated from the inside of the carbonization chamber, and the partition wall is connected to the partition wall by the rise of the gas passage and the thermal conductivity of the partition wall. A method of coking the charge by transferring part of the heat of the gas to the upper end region of the charge in contact is disclosed. The method developed based on this method is disclosed in Japanese Patent Publication No. 61-49353, “Inside of the furnace lid, the end portions of individual shielding members joined with caulking plates through spacer pieces are overlapped. A coke oven lid provided with a shield for passing gas generated in the furnace, and a “coke oven lid provided with a metal shield for the gas passage inside the furnace lid body” of Japanese Utility Model Publication No. 6-43146. Is. By providing a shield for passing gas generated in the furnace inside the furnace lid in this way, the coal particles charged in the vicinity of the furnace lid accelerate the heating rate compared to the previous furnace lid, Significantly reduce the occurrence of bad coke. Further, in order to accelerate the temperature rise rate in the shield, for example, as disclosed in Japanese Patent Publication No. 5-38795, “air or oxygen is blown into the isolation chamber from the outside in order to burn the combustible gas passing through the shield. "Furnace with a nozzle to be installed", Japanese Patent Application Laid-Open No. 8-283735, "Insulation material such as carbon fiber and ceramic fiber with a brick-like heat insulating material lined inside the furnace and a gas passage inside. Developed various types of furnace lids such as `` furnace lids with air or oxygen blowing nozzles in the gas passages, which are fixed in close contact with heat-insulating concave heat-resistant members with gas gap holes in the gap '' Has been.

In this way, by providing a thermally conductive metal partition wall or metal shield inside the furnace lid body, it has the effect of increasing the heating rate of the coal particles inserted in the vicinity of the furnace lid. Currently, it is not 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 apparent from the above Japanese Patent Publication No. 3-40074, etc., the metal partition wall is made of a thin metal plate, so that it is excessively repeated from the high temperature (expansion) to the rapid cooling (shrinking) every time the coke kiln is discharged. There is a problem that it is deformed into a strain under the influence of various thermal stresses to block or narrow the gas flow. Furthermore, as with the metal barrier, the metal shield also has the problem that the mud tar generated during dry distillation flows into the vent and solidifies and closes, and the removal of the tar solidified at the vent has a high heat while opening the furnace lid. It seems that there were many problems that had to be solved in the future, such as problems that had to be done while holding the company.
Japanese Patent Publication No. 3-40074 (page 3 Fig. 1) Japanese Examined Patent Publication No. 61-49353 (FIG. 8 on page 7) Japanese Utility Model Publication No. 6-43146 (FIG. 1 on page 2) Japanese Patent Publication No. 5-38795 (FIG. 1 on the second page) Japanese Patent Laid-Open No. 8-283735 (page 3 in FIG. 3)

In order to solve such a problem, the present inventors have provided a bottomless gas distribution box having a bottomless structure in which a metal strip plate that prevents intrusion of coal particles is provided in the left and right with a ventilation gap in parallel in the vertical and horizontal directions. The coke oven lid, which was attached to the inside of the main body through a heat insulation box, was first developed.
Furthermore, the present inventors have provided an in-furnace gas distribution box that raises the temperature of the in-furnace gas discharged from the carbonization furnace, which holds the high-temperature heat, to a high temperature while ensuring heat retention. As a result of various studies for the purpose of providing a temperature rising type coke oven lid, as a result of the earth graphite from the thermal insulation box side between the thermal insulation box provided inside the furnace of the furnace lid structure and the gas distribution box in the furnace. It was found that by applying a coating layer and a lining layer of a heat-resistant backing sheet, the object was achieved, and the generation of tar that was easily generated in the coke oven frame and the coarse furnace lid was significantly reduced. The present invention is configured based on this finding.

  The gist of the furnace lid structure that opens and closes the entrance / exit of the carbonization furnace through a heat-resistant metal seal plate provided with a flange member having an edge cross-sectional shape that presses the furnace opening frame of the carbonization furnace charged with coal particles. Laminated graphite film, heat-resistant packing sheet and heat-resistant metal sheet are laminated in a heat-insulating box provided inside the furnace, and air is passed between adjacent heat-resistant metal strips or heat-resistant metal frames inside the furnace. It is a temperature rising type coke oven lid having a structure in which a gas distribution box having a bottomed or bottomless frame structure is provided in parallel with a gap for use. Furthermore, the present invention is a temperature rising type coke furnace lid having a structure in which an air injection nozzle having an air supply source is provided outside the furnace lid structure in the in-furnace gas distribution box having the bottomless frame structure. .

  According to the temperature rising type coke oven lid of the present invention described above, the heat resistance of the heat insulation box is obtained by laminating a heat resistant packing sheet and a heat resistant metal sheet by applying a coating film of earthy graphite to the heat insulation box. In addition, the heat released from the furnace lid is reduced to ensure the temperature rise and heat retention in the in-furnace gas distribution box, and the in-furnace gas combustion heat flowing from the carbonization furnace or into the in-furnace gas distribution box The coal particles charged in the vicinity of the furnace lid with combustion heat are carbonized and coke, and the produced mud tar is burned and decomposed and extinguished.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. FIG. 1 is a cross-sectional view of a coke carbonization furnace lid in which the inlet / outlet on the coke discharge side (or coke extruder side) of the carbonization furnace is closed and the carbonization furnace in the vicinity thereof. Indicates. In FIG. 1, reference numeral 1 denotes a carbonization furnace in which coal particles 2 are charged. That is, the carbonization furnace 1 is provided in a structure in which the coal particles 2 are carbonized by heating furnaces (not shown) provided on both sides. 3 is a furnace cover structure. The furnace lid structure 3 is a steel carbonization furnace lid frame 6 provided with a normal fastening structure 5 formed by combining ordinary fastening members such as compression springs and screw bolts pressed against the furnace opening frame 4 of the carbonization furnace 1. A heat-resistant metal seal plate 9 and an in-furnace plate 10 which are in contact with a furnace opening frame 4 provided with a slide plate 7 and a flange member 8 having a knife edge cross-sectional shape are mounted on the carbonization furnace side of the furnace. The doorway 11 of the carbonization furnace 1 is opened and closed. The furnace lid structure 3 in the present invention is not limited to the above-described structure, and may have any structure as long as it prevents leakage of gas in the furnace from the inlet / outlet port 11 of the carbonization furnace 1. 12 is a heat insulation box. The heat insulating box 12 is a metal box filled with a heat insulating material generally used such as alumina silicate or ceramics. The heat insulating box 12 is provided inside the furnace of the furnace lid structure 3 to release the high-temperature heat held by the gas in the furnace. To prevent. 13 is a furnace gas distribution box. The in-furnace gas distribution box 13 is a bottomed or bottomless heat-resistant metal hollow structure having a structure in which the in-furnace gas generated from the coal particles 2 of the carbonization furnace 1 easily flows. A horizontal support frame 14 is provided at a position where the horizontal support frame 14 is divided, and a heat resistant metal strip 15 is provided between the upper and lower spaces of the horizontal support frame 14 and a ventilation gap 16 is provided between the left and right or the upper and lower sides, or both vertically and horizontally. It is a thing. In the present invention, an in-furnace gas distribution box 13 may be provided in the furnace height direction by providing a ventilation gap 16 between the upper and lower sides of a large number of annular or discontinuous annular refractory metal strip frames. Reference numeral 22 denotes a pressing tool that can be moved back and forth, and is provided in the pressing structure using a cylinder, a spring, or the like that presses the flange member 8 of the seal plate 9 against the furnace port frame 4.

Further, in the present invention, as shown in FIG. 2 in an enlarged perspective view of the cross-section carbonization furnace side of the line AA in FIG. 1, the insulating film 12 is coated with a ground graphite coating film 17, a heat resistant packing sheet 18, a heat resistant metal. After laminating the sheets 19, the in-furnace gas distribution box 13 is attached. In the present invention, the laminated layer has an effect of blocking the heat of the in-furnace gas distribution box 13 that is heated to a high temperature and preventing the shape change and the burnout of the heat insulating box 12. In particular, the coating film 17 of earthy graphite has a lower crystallinity than scale graphite, so that the coating adhesion is good, and since the content of TiO ₂ and Fe ₂ O ₃ components is small, the softening temperature is high, and thus the heat insulating box. 12 and the heat-resistant packing sheet 18 are firmly adhered over a long period of time. The heat-resistant packing sheet 18 is a sheet made of ceramic fiber or graphite material in addition to heat-resistant rubber, and has a heat resistance and is a deforming and pressing material that occurs due to a heat change of a metal material such as the heat insulating box 12 or the heat resistant metal sheet 19. Absorbs pressure (stress) and has the effect of maintaining the shape of the furnace lid structure for a long period of time.

  Further, as another embodiment of the present invention, in order to burn the in-furnace gas flowing through the in-furnace gas distribution box 13, as shown in FIG. In addition, one or more air jet nozzles 21 having an air supply valve 20 that automatically or mechanically opens and closes by furnace pressure control on the outside of the furnace cover structure 3 at the furnace pressure control, or at two or more intervals It may be provided. FIG. 1 shows an embodiment in which three air ejection nozzles 21 are arranged at an arbitrary interval in the in-furnace gas distribution box 13. That is, an amount of air necessary for combustion of the in-furnace gas flowing into the in-furnace gas distribution box 13 from the carbonization furnace 1 is supplied from the air supply valve 20 and ejected from the air ejection nozzle 21, and the in-furnace gas circulation The temperature inside the hollow of the box 13 is raised, and the coal particles 2 charged in the carbonization furnace 1 in the vicinity of the furnace lid are further heated and dry-distilled.

  The coke oven lid of the present invention configured as described above closes the inlet / outlet port 11 of the carbonization furnace 1 in the same manner as the above-described conventional coke manufacturing operation, and then charges the carbonization furnace 1 with the coal particles 2. Dry distillation is performed while supplying high-temperature heat from a heating furnace (not shown) adjacent to the post-carbonization furnace 1. The in-furnace gas having high temperature heat generated during dry distillation heats the heat-resistant metal strip 15 while flowing into the in-furnace gas distribution box 13, and further heat-resistant from the hollow of the in-furnace gas distribution box 13. The coal particles 2 charged on the furnace lid side of the carbonization furnace 1 are heated via the metal strip 15 to produce good dry distillation coke. Further, an amount of air necessary for burning the furnace gas flowing into the hollow of the in-furnace gas distribution box 13 is supplied from the air supply valve 20 and the air ejection nozzle 21, and The coal particles 2 charged on the furnace lid side of the carbonization furnace 1 are heated via the heat-resistant metal strip 15. In particular, the coke oven lid of the present invention is provided with a laminated liner such as earth graphite coating film 17 and heat resistant packing sheet 18 between the gas distribution box 13 in the furnace and the heat insulating box 12. The heat released spontaneously is cut off, the temperature in the hollow of the in-furnace gas distribution box 13 is raised to a high temperature, and high-quality coke is produced up to the coal particles 2 in the vicinity of the furnace lid to improve the yield. In addition, the unburned gas in the furnace gas that has flowed into the furnace gas distribution box 13 that has been heated to a high temperature is combusted to significantly reduce the generation of tar. Cleaner work may be omitted. This effect is significant when the air jet nozzle 21 is provided in the in-furnace gas distribution box 13.

  The temperature rising type coke oven lid of the present invention, which has excellent heat resistance and durability, accelerates the heating of the coal particles charged near the carbonization oven lid, increases the production of good coke, and continues to operate stably. Because of its many advantages, it is likely to be put to practical use in the coke manufacturing industry.

The drawing shows an embodiment of the present invention, and shows a cross-sectional view of a coke carbonization furnace lid in which the inlet / outlet on the coke discharge side (or coke extruder side) of the carbonization furnace is closed and the carbonization furnace in the vicinity thereof. The AA line section carbonization furnace side of Drawing 1 is shown with an expansion perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carbonization furnace 2 Coal particle 3 Furnace lid structure 4 Furnace frame 8 Flange member 9 Seal plate 12 Heat insulation box 13 Gas distribution box 15 in a furnace Heat-resistant metal strip 16 Ventilation gap 17 Earth-like graphite coating film 18 Heat resistance Packing sheet 19 Heat-resistant metal sheet 20 Air supply valve 21 Air ejection nozzle

Claims (2)

  Provided inside the furnace lid structure that opens and closes the entrance / exit of the carbonization furnace through a heat-resistant metal seal plate around a flange member having an edge cross-sectional shape that presses the furnace opening frame of the carbonization furnace charged with coal particles A heat-resistant metal sheet, a heat-resistant packing sheet, and a heat-resistant metal sheet are laminated in order, and the inside of the furnace is ventilated between adjacent heat-resistant metal strips or heat-resistant metal strip frames. A temperature rising type coke oven lid characterized in that it is constructed by providing an in-furnace generated gas distribution box having a bottomless frame structure in parallel with a gap for use.   Provided inside the furnace lid structure that opens and closes the entrance / exit of the carbonization furnace through a heat-resistant metal seal plate around a flange member having an edge cross-sectional shape that presses the furnace opening frame of the carbonization furnace charged with coal particles A heat-resistant metal sheet, a heat-resistant packing sheet, and a heat-resistant metal sheet are laminated in order, and the inside of the furnace is ventilated between adjacent heat-resistant metal strips or heat-resistant metal strip frames. In addition, an in-furnace generated gas distribution box having a bottomless frame structure arranged in parallel with a gap for use is provided, and an air supply nozzle having an air supply source outside the furnace lid structure is provided in the in-furnace generated gas distribution box. A temperature rising coke oven lid characterized by being provided.

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