JP2005120331A - Gateway frame of carbonizing oven having extremely less deformation and crack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gateway frame of a carbonizing oven, preventing its partial loss by fusion caused by a high dry distillation temperature of coal particles and also reducing the occurring of deformation and crack such as C-shaped warpage, curved deformation, etc., caused by an effect from unavoidable expansion. <P>SOLUTION: The gateway frame of the carbonizing oven is characterized in that a heat-resistant alloy member 13 is fitted with play in an engaging joint form to the inner circumferential face of the carbonizing oven side of an upper beam member 11 of the gateway frame 4 of the carbonizing oven to which a knife-edge sectional shape sealing flange member, provided at the carbonizing oven side of the oven lid for opening and closing the gateway of the carbonizing oven of a coke oven, is abutted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a furnace port frame of a carbonization furnace that abuts a sealing flange member of a furnace lid that opens and closes a carbonization chamber (furnace) entrance and exit of a coke oven.

The furnace lid that opens and closes the carbonization furnace inlet / outlet of the coke oven is a sturdy steel frame structure that can withstand the high carbonization temperature of coal particles charged in the carbonization furnace. CO and CH generated during the carbonization of coal particles _In order to prevent global environment pollutant gas leaks such as _4, etc., it is manufactured in a structure with a high gas sealing property. For this reason, there are many patent publications relating to carbonization furnace lids intended for high sealing performance. For example, in Japanese Utility Model Publication No. 7-38156, “the furnace lid main body is confined in a metal furnace lid main body provided in the carbonization furnace fastening structure to prevent warping and bending of the furnace lid main body by convection of the air. In addition, a seal plate having a pressing structure is provided in which a sealing flange member having a knife edge cross-sectional shape that abuts against the carbonization furnace port frame is provided through a sealed box that keeps the furnace port warmed by heating in the furnace lid body. In addition, the `` furnace lid provided with refractory bricks that enter the vicinity of the furnace port of the carbonization furnace '' reduces the temperature difference between the inside and outside of the furnace lid using convection of air inside the furnace lid body confined in a sealed box. There is a furnace lid in which main body distortion (warping and bending) is minimized to improve the gas seal followability of the sealing flange member. Further, JP 2001-288472 A discloses a “in-furnace plate, heat-resistant packing sheet, through a seal plate in which a flange member having a knife-edge cross-sectional shape is provided around the carbonization furnace side of the furnace lid frame that opens and closes the carbonization furnace port, Excellent heat-tightness in the carbonization furnace with a slide plate for superposed members made of refractory bricks that enter the carbonization furnace and a retractable mechanism that presses the flange member of the seal plate toward the carbonization furnace. A “furnace lid” has been developed.

            Japanese Utility Model Publication No. 7-38156 (page 4 Fig. 1)             Japanese Patent Laying-Open No. 2001-288472 (first page, FIG. 3)

Problems to be solved by the invention

  As described above, each furnace lid is designed to have a heat-resistant structure and an airtight structure. However, the thick-walled (160 mm cast iron) carbonization furnace mouth frame that abuts the flange cross-sectional flange member provided at the peripheral edge of the seal plate is exposed to the high dry distillation temperature of coal particles. (Opening) There was a problem of partial melting on the carbonization furnace side of the inner peripheral surface. Also, the carbonization furnace frame gradually undergoes C-shaped warping and bending deformation under the usage conditions in which rapid heating and rapid cooling heat cycles are repeated each time the furnace lid is opened and closed, and a gap is formed between the contact with the furnace lid. There was a problem of forming and releasing the gas generated in the furnace. Further, in the upper girder member of the carbonization furnace port frame, there is a problem that cracks are generated from the carbonization furnace side of the inner peripheral surface of the furnace port or both corners of the inner periphery and propagate greatly upward. Therefore, even when a furnace lid with excellent airtightness is brought into contact with the carbonization furnace frame, C-shaped warpage, curved deformation or cracking occurs in the carbonization furnace frame, and the airtightness in the carbonization furnace is not maintained for a long time. was there.

First, as a result of investigating the cause of the carbonization furnace frame that caused this problem in a practical coke oven from the appearance observation, the metallographic structure observation, and various material tests, the carbonization furnace frame was generated. It was considered that the partial erosion was a phenomenon that the cast iron material could not withstand the high combustion temperature of coal particles and eventually occurred. The C-shaped warping and bending deformation of the carbonization furnace mouth frame, expansion occurs while passing through the expansion and the A ₁ transformation by graphitization of compounds the carbon that occurs in thermal cycle of heating and cooling which are repeated for each opening and closing of the furnace lid, large growth It was considered that the carbonization furnace gas and air that entered the inside of the flake graphite through the gap oxidized the iron and silicon in the cast iron to produce oxides with a large volume, which gradually increased. In addition, cracks appear to have been observed from the observation of the appearance that the upper girder member of the carbonization furnace frame has been heated to a particularly high temperature, affected by external shrinkage that is cooled from the temperature and thermal stress that is subject to large tensile stress from the inside. However, it was considered that it gradually advanced greatly along the low flake graphite with low strength.

Means for solving the problem

Furthermore, the present inventors prevent partial melting of the carbonization furnace frame due to the high combustion temperature of the coal particles based on the knowledge and consideration of the phenomenon described above, and C-shaped warping and bending caused by the influence of inevitable expansion. As a result of various investigations aimed at providing a carbonization furnace frame with less deformation and cracking, a heat-resistant metal member is loosely fitted to a place where erosion, deformation and cracks are likely to occur, that is, an upper girder member of the carbonization furnace frame. I found out that the purpose was achieved.
The present invention is configured on the basis of this knowledge, and the gist thereof is a carbonization furnace port for contacting a sealing flange member having a knife edge cross-sectional shape provided on the carbonization furnace side of the furnace lid for opening and closing the carbonization furnace entrance and exit of the coke oven This is a carbonization furnace opening frame in which the heat resistant alloy member is loosely fitted in the shape of a latching joint on the carbonization furnace side of the opening side inner peripheral surface as the upper girder member of the frame, and the deformation and cracks are extremely small.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention, and shows a sectional view in the high direction of the carbonization furnace in the vicinity of the carbonization furnace outlet (or inlet). In FIG. 1, reference numeral 1 denotes a press-type furnace lid, which seals the carbonization furnace 2 while pushing the carbonization furnace frame 4 mounted on the peripheral edge of the inlet / outlet 3 on the coke extruder side or the coke discharge side of the carbonization furnace 2. On the carbonization furnace side of the steel frame body 5 that can be freely opened and closed, a flexible heat-resistant metal seal plate provided with a flange member 6 having a knife-edge cross-sectional shape that presses the carbonization furnace mouth frame 4 at the peripheral edge. 7 and, if necessary, a refractory brick 8 protruding into the carbonization furnace or a two-layer refractory member or a refractory metal strip with an irregular refractory material applied to the refractory brick 8 through a heat-resistant packing sheet. A heat-resistant structure for polymerizing various heat-resistant members is provided, such as a heat-resistant structure composed of in-furnace gas generation regenerator compartments and heat insulation boxes arranged vertically and horizontally. Further, on the outside of the furnace of the steel frame 5, a flange 9 formed by combining a fastening member such as a compression spring or a bolt for strongly pressing and fastening the entrance / exit 3 of the carbonization furnace 1, and the above-described seal plate 7 is provided with a pressing jig 10 that can be moved forward and backward using a cylinder, a spring, or the like that presses the flange member 6 against the carbonization furnace mouth frame 4. That is, the furnace lid 1 is provided in a heat-resistant structure that closes the inlet / outlet 3 of the carbonization furnace 2 and seals the inside of the carbonization furnace. In the present invention, the structure is not particularly limited. A normally used furnace lid structure may be used.

FIG. 2 shows an embodiment of the carbonization furnace mouth frame 4 in a lower cutaway drawing, and shows a cross sectional view a of the upper girder member in the furnace height direction and a carbon furnace side external view b thereof. The carbonization furnace opening frame 4 is cast or processed into one in which the upper girder member 11, the lower girder member (not shown for notch drawing) and the column member 12 are joined together in a frame shape or in an integral shape. In the vicinity of the corner of the upper girder member 11 which is made of thick cast iron manufactured in this way and is likely to cause large expansion and cracking under severe use conditions, and also to the adjacent column member 12. In addition, the heat-resistant alloy member 13 is loosely fitted in the shape of a hook joint on the carbonization furnace side of the inner peripheral surface of the frame (opening side). In other words, the present invention provides the carbonization furnace frame 4 where the shape change of the carbonization furnace frame 4 due to graphitization of the cast iron material and the expansion caused by the oxide, and the problem of cracks that occur along the flake graphite are likely to occur. The above-described problems are to be solved by loosely fitting a heat-resistant metal member that does not graphitize or generate many oxides. A heat-resistant alloy member is a metal that belongs to ferrite and austenite from the crystal structure, has a shape that does not change shape at high temperatures, and has strength that can withstand erosion of high-temperature gas. Heat-resistant steel containing special elements such as molybdenum, silicon, tungsten, etc. In addition to heat-resistant chromium steel, nickel-chrome heat-resistant steel, molybdenum heat-resistant steel, sill chromium heat-resistant steel, etc., special metals such as nickel-based alloys such as Inconel metal are used. May be. Further, in the present invention, both the upper girder member 11 and the heat-resistant alloy member 13 loosely fitted to the upper girder member 11 have a refracted joint shape and a so-called hooked joint shape, and both members from the carbonization furnace side. Since the joint surface is assembled so that it can be freely moved back and forth while rubbing the joint surface of the steel, the heat-resistant alloy member 13 is not dropped during the opening / closing operation of the furnace lid 1, and the coal flying from the carbonization furnace In addition to preventing the entry of fine particles and preventing tar formation between joints, the gap formed by loose fitting absorbs the expansion of each member. Even if it occurs, even if it occurs, there is an effect of preventing propagation to the heat-resistant alloy member 13.
Reference numeral 14 denotes a screw bolt. The screw bolt 14 is dropped when the heat-resistant alloy member 13 inserted into the upper girder member 11 is subjected to some impact during transportation of the carbonization furnace mouth frame 4, during coke operation, or during opening and closing operation of the furnace lid, This is a fastener for the heat-resistant metal member 13 that is moved from the loose-fitting position to prevent the function of the carbonization furnace mouth frame 4 from being lowered.

  The carbonization furnace frame 4 of the present invention assembled in the structure as described above is attached to the peripheral edge of the entrance / exit 3 of the carbonization furnace 2 in the same manner as the conventional cast iron carbonization furnace frame. The inside of the carbonizing furnace is sealed while being pressed by a flange member 6 having a knife edge cross-sectional shape provided in 1 through a seal plate 7.

The invention's effect

  According to the carbonization furnace mouth frame 4 of the present invention as described above, the heat resistant alloy member 13 that does not generate a graphite structure is formed on the upper girder member 11 that receives overheating and on the carbonization furnace side of the opening side inner peripheral surface. Moreover, since it is manufactured as a cast-iron structure having a loose fitting structure in consideration of expansion, C-shaped warpage and curved deformation are remarkably reduced without causing partial melting damage. For example, even if a crack is generated in a cast iron member having a large expansion, propagation is prevented by the clearance of the hook joint shape, so that the heat-resistant alloy member 13 is not affected and the carbonization furnace frame 4 of the present invention continues for a long time. Can be used.

  1 is a cross-sectional view in the furnace height direction in one embodiment of the vicinity of a carbonization furnace outlet in the present invention.   An embodiment of the carbonization furnace frame is shown in a lower side cutaway drawing, and shows a sectional view a in the upper girder member furnace height direction and an appearance view b on the side of the carbonization furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace 2 Carbonization furnace 3 Entrance / exit 4 Carbonization furnace port frame 6 Flange member for sealing 11 Upper girder member 13 Heat-resistant alloy member

Claims (1)

  A carbonization furnace frame (4) that abuts a sealing flange member (6) having a knife edge cross-sectional shape provided on the carbonization furnace side of a furnace lid (1) that opens and closes the inlet / outlet (3) of the carbonization furnace (2) of the coke oven. A carbonizer furnace frame having very little deformation and cracking, characterized in that a heat-resistant alloy member (13) is loosely fitted in the shape of a hook joint on the opening side inner peripheral surface of the upper girder member (11).

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