Charging port lid of coke oven

Abstract

To provide a charging port lid of a coke oven which is less likely to undergo lack of a refractory at a part in contact with a bottom end surface of a tubular part of an iron shell and damage to a refractory due to deformation of the iron shell.SOLUTION: A charging port lid of a coke oven is a lid inserted into a charging port of the coke oven and includes an iron shell and a refractory. The iron shell includes an upper surface part and a tubular part. The refractory has an upper part and a lower part. The upper surface part of the iron shell covers an upper surface of the upper part of the refractory. The tubular part of the iron shell covers a side surface of the upper part of the refractory. A bottom part of the refractory fitted into the charging port of the coke oven has a tapered structure which is downwardly tapered. An outer periphery surface of the bottom part of the refractory has a tapered surface formed thereinto. A bottom end of each of an outer periphery surface and an inner periphery surface of the tubular part of the iron shell is chamfered. The chamfered outer periphery surface and inner periphery surface come across each other to form a bottom end top edge. The chamfered outer periphery surface of the iron shell is smoothly linked to the tapered surface of the refractory.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a charging hole cover for a coke oven carbonization chamber. [Background technology]

[0002] The coke oven has a circular charging hole in the ceiling, and the charging hole cover is opened before the coal is charged into the chamber. After the coal is charged, a concentric charging hole cover is fitted into the charging hole to seal the chamber.

[0003] The charging hole cover has a steel shell on the top surface, and the charging hole cover is opened by activating an electromagnet installed on the coal loading car, attracting the steel shell to the electromagnet and lifting the charging hole cover. The coking chamber is sealed by attracting the steel shell to the electromagnet, fitting the charging hole cover into the charging hole, and then stopping and removing the electromagnet.

[0004] Since the temperature of the carbonization chamber during sealing and heating reaches over 1000℃, the charging hole cover is equipped with refractory on the side where it fits into the charging hole, and the upper surface of the refractory is covered with a steel shell. The steel shell is further designed to cover the side of the upper part of the refractory in a cylindrical shape to protect the refractory from impacts when the charging hole cover is opened and closed. The lower part of the refractory that fits into the charging hole of the coke oven has a tapered structure (e.g., a truncated cone, truncated sphere, truncated pyramid, etc.) that tapers downward to improve sealing with the charging hole, and the outer circumferential surface of the lower part of the refractory is made into a tapered surface. Summary of the Invention [Problem to be solved by the invention]

[0005] Figures 1 and 2 show the cross-sectional structure of a conventional charging hole cover.

[0006] The charging hole cover 10 shown in FIG. 1 has a rectangular cross section at the lower end of the cylindrical part of the shell 11, and the refractory 12 covers the lower end surface of the cylindrical part of the shell 11. This structure has a problem that the refractory 12 is easily chipped at the part where it contacts the lower end surface of the cylindrical part of the shell 11. The charging hole cover 10 shown in FIG. 2 has a chamfered lower end of the outer circumferential surface of the cylindrical part of the shell 11, smoothly connected to the tapered surface at the lower part of the refractory 12, and the outer circumferential chamfered surface of the cylindrical part of the shell 11 intersects with the inner circumferential surface to form the lower end apex edge. This structure has a problem that the lower end apex edge of the shell 11 is sharp, and the cylindrical part of the shell 11 is easily deformed so as to bite into the refractory 12, which promotes damage. If these problems occur, the charging hole becomes insufficiently sealed, and gas from the coke oven carbonization chamber may leak into the environment, which may cause health damage to the human body.

[0007] Here, the fact that the outer peripheral chamfered surface of the shell 11 is smoothly connected to the tapered surface of the refractory material 12 means that the following two conditions are satisfied. The gap between the bottom end of the outer chamfered surface of the steel shell 11 and the top end of the tapered surface of the refractory material 12 is within 5 mm. The angle between the outer chamfered surface of the shell 11 and the tapered surface of the refractory material 12 is within 20° in the inner circumferential direction and within 10° in the outer circumferential direction.

[0008] The present disclosure has been made in consideration of the above-mentioned circumstances, and an object of the present disclosure is to provide a coke oven loading hole cover that is less susceptible to loss of refractory material at the portion in contact with the lower end surface of the tubular portion of the iron shell or damage to the refractory material due to deformation of the iron shell. [Means for solving the problem]

[0009] One aspect of the present disclosure is A cover to be inserted into a charging hole of a coke oven, The furnace comprises an iron shell and a refractory material, The shell has an upper surface portion and a cylindrical portion, The refractory body has an upper portion and a lower portion, the upper surface portion of the shell covers an upper surface of the upper portion of the refractory material, The cylindrical portion of the shell covers a side surface of the upper portion of the refractory material, The lower part of the refractory material to be fitted into the charging hole of the coke oven has a tapered structure tapered downward, and an outer peripheral surface of the lower part of the refractory material is a tapered surface, a lower end of an outer peripheral surface and an inner peripheral surface of the tubular portion of the shell are chamfered, and the outer peripheral chamfered surface and the inner peripheral chamfered surface intersect to form a lower end apex edge; The present invention relates to a coke oven charging hole cover, characterized in that the outer peripheral chamfered surface of the iron shell is smoothly connected to the tapered surface of the refractory material.

[0010] Such a charging hole cover reduces the loss of the refractory at the portion in contact with the lower end surface of the tubular part of the shell. This is believed to be because the lower end of the inner peripheral surface of the tubular part of the shell is chamfered, so that the angle between the portion of the upper part of the refractory that is in contact with the inner peripheral surface of the shell and the portion in contact with the inner peripheral chamfered surface of the shell becomes obtuse, and stress is dispersed. In addition, damage to the refractory caused by the lower end of the tubular part of the shell is reduced. This is believed to be because the outer peripheral chamfered surface and the inner peripheral chamfered surface of the tubular part of the shell intersect to form the lower end apex edge, reducing the sharpness of the lower end apex edge of the tubular part of the shell and reducing the bite into the refractory. Furthermore, the chamfering of the lower end of the inner peripheral surface of the tubular part of the shell moves the sharpness of the lower end apex edge of the tubular part of the shell toward the outer peripheral surface of the tubular part, and this is believed to be because deformation of the tubular part that bites into the refractory due to the difference in thermal expansion between the inner peripheral surface and the outer peripheral surface of the tubular part is reduced.

[0011] In one aspect of the present disclosure, It is preferable that the angle between the inner peripheral surface of the shell and the inner peripheral chamfered surface is 100 to 170°.

[0012] It is believed that the angle between the part of the upper part of the refractory that contacts the inner peripheral surface of the shell and the part that contacts the inner peripheral chamfered surface of the shell becomes obtuse, which disperses stress and reduces chipping of the refractory at the part that contacts the lower end surface of the tubular part of the shell. It is also believed that the sharpness of the apex edge of the lower end of the tubular part of the shell is reduced, which reduces biting into the refractory.

[0013] In one aspect of the present disclosure, When the heights from the upper ends of the outer peripheral chamfered surface and the inner peripheral chamfered surface of the iron shell to the lower end apex edge are h1 and h2, respectively, it is preferable that 1≦h1 / h2≦4.

[0014] With h1 / h2 being 1≦h1 / h2, the height of the outer peripheral surface of the tubular part of the shell becomes relatively small, which is thought to reduce deformation that cuts into the refractory due to the difference in thermal expansion between the inner peripheral surface and the outer peripheral surface of the tubular part. Also, with h1 / h2≦4, the binding force of the shell to the refractory becomes strong, which is thought to reduce chipping of the refractory.

[0015] In one aspect of the present disclosure, a gap between a lower end of the outer peripheral chamfered surface of the shell and an upper end of the tapered surface of the refractory material is within 5 mm; It is preferable that an angle formed by the tapered surface of the refractory material with respect to the outer peripheral chamfered surface of the shell is within 20° in the inner circumferential direction and within 10° in the outer circumferential direction.

[0016] By keeping the gap between the bottom end of the outer chamfered surface of the shell and the top end of the tapered surface of the refractory within 5 mm, gas in the coke oven chamber is less likely to leak into the environment. In addition, by keeping the angle of the tapered surface of the refractory to the outer chamfered surface of the shell within 20° in the inner circumferential direction, the hot air inside the furnace is less likely to be transmitted to the shell, making it less likely to deform, and by keeping the angle within 10° in the outer circumferential direction, the sealing of the charging hole of the coke oven and the charging hole cover is improved. [Brief description of the drawings]

[0017] [Figure 1] 1 shows a cross-sectional structure of a conventional charging hole cover. [Diagram 2] 1 shows a cross-sectional structure of a conventional charging hole cover. [Diagram 3] 1 shows a cross-sectional structure of a charging hole cover of this embodiment. [Figure 4] An enlarged view of the vicinity of the lower end top edge of the cylindrical portion of the iron shell of the charging hole cover of this embodiment is shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] A preferred embodiment of the present disclosure will be described in detail below. Note that the embodiment described below does not unduly limit the contents of the present disclosure described in the claims, and all of the configurations described in the embodiment are not necessarily essential as a means for solving the problems of the present disclosure.

[0019] 3 and 4 respectively show a cross-sectional structure of the charging hole cover 10 of this embodiment and an enlarged view of the vicinity of the lower end top edge of the cylindrical part of the iron shell 11 of the charging hole cover 10 of this embodiment.

[0020] The coke oven charging hole cover 10 of this embodiment is a cover that is inserted into the charging hole of a coke oven, and comprises an iron shell 11 and a refractory material 12, the iron shell 11 has an upper surface portion and a cylindrical portion, the refractory material 12 has an upper portion and a lower portion, the upper surface portion of the iron shell 11 covers the upper surface of the upper portion of the refractory material 12, the cylindrical portion of the iron shell 11 covers the side surface of the upper portion of the refractory material 12, the lower portion of the refractory material 12 that is fitted into the charging hole of the coke oven has a tapered structure that tapers downward, the outer peripheral surface of the lower portion of the refractory material 12 is a tapered surface, the outer peripheral surface and the lower ends of the inner peripheral surface of the cylindrical portion of the iron shell 11 are each chamfered, the outer peripheral chamfered surface and the inner peripheral chamfered surface intersect to form a lower end apex edge, and the outer peripheral chamfered surface of the iron shell 11 smoothly connects to the tapered surface of the refractory material 12.

[0021] Such a charging hole cover 10 reduces chipping of the refractory 12 at the portion in contact with the lower end surface of the tubular part of the shell 11. This is believed to be because the lower end of the inner peripheral surface of the tubular part of the shell 11 is chamfered, so that the angle between the portion of the upper part of the refractory 12 in contact with the inner peripheral surface of the shell 11 and the portion in contact with the inner peripheral chamfered surface of the shell 11 becomes obtuse, dispersing stress. Also, damage to the refractory 12 caused by the lower end of the tubular part of the shell 11 is reduced. This is believed to be because the outer peripheral chamfered surface and the inner peripheral chamfered surface of the tubular part of the shell 11 intersect to form the lower end apex edge, reducing the sharpness of the lower end apex edge of the tubular part of the shell 11 and reducing biting into the refractory 12. Furthermore, it is believed that the chamfering of the lower end of the inner peripheral surface of the tubular portion of the shell 11 moves the pointed top edge of the lower end of the tubular portion of the shell 11 toward the outer peripheral surface of the tubular portion, thereby reducing deformation of the tubular portion that bites into the refractory material 12 due to the difference in thermal expansion between the inner and outer peripheral surfaces. The tapered structure of the lower portion of the refractory material 12 is not particularly limited, and examples thereof include a truncated cone, a truncated sphere, a truncated pyramid, etc.

[0022] In the charging hole cover 10 of the coke oven of this embodiment, the angle between the inner peripheral surface of the shell 11 and the inner peripheral chamfered surface is preferably 100 to 170°, more preferably 110 to 160°, and even more preferably 120 to 150°.

[0023] It is believed that the angle between the portion of the upper part of the refractory 12 that contacts the inner peripheral surface of the shell 11 and the portion that contacts the inner peripheral chamfered surface of the shell 11 becomes obtuse, which disperses stress and reduces chipping of the refractory 12 at the portion that contacts the lower end surface of the tubular part of the shell 11. It is also believed that the sharpness of the apex edge of the lower end of the tubular part of the shell 11 is reduced, which reduces biting into the refractory 12.

[0024] In the coke oven loading hole cover 10 of this embodiment, if the heights from the upper ends of the outer chamfered surface and the inner chamfered surface of the iron shell 11 to the lower top edge are h1 and h2, respectively, then preferably 1≦h1 / h2≦4, and more preferably 1.5≦h1 / h2≦3.

[0025] Because h1 / h2 is 1≦h1 / h2, the height of the outer peripheral surface of the tubular portion of the shell 11 becomes relatively small, which is thought to reduce deformation that occurs due to the difference in thermal expansion between the inner and outer peripheral surfaces of the tubular portion and that cuts into the refractory 12. In addition, because h1 / h2≦4, the binding force of the shell 11 to the refractory 12 becomes strong, which is thought to reduce chipping of the refractory 12.

[0026] In the charging hole cover 10 of the coke oven of this embodiment, the gap between the lower end of the outer peripheral chamfered surface of the shell 11 and the upper end of the tapered surface of the refractory material 12 is preferably 5 mm or less, more preferably 4 mm or less, even more preferably 2 mm or less, and particularly preferably 0 mm, and the angle of the tapered surface of the refractory material 12 with respect to the outer peripheral chamfered surface of the shell 11 is preferably 20° or less in the inner peripheral direction and 10° or less in the outer peripheral direction, more preferably 10° or less in the inner peripheral direction and 5° or less in the outer peripheral direction, even more preferably 10° or less in the inner peripheral direction and 5° or less in the outer peripheral direction, and particularly preferably 0°. When the tapered surface of the refractory material 12 is a curved surface, the angle of the tangent plane of the upper end of the tapered surface of the refractory material 12 with respect to the outer peripheral chamfered surface of the shell 11 is preferably within the above-mentioned range.

[0027] By reducing the gap between the bottom end of the outer chamfered surface of the shell and the top end of the tapered surface of the refractory, gas in the coke oven chamber is less likely to leak into the environment. In addition, by making the angle between the outer chamfered surface of the shell and the tapered surface of the refractory within 20° in the inner circumferential direction, the hot air inside the furnace is less likely to be transmitted to the shell, making it less likely to deform, and by making the angle within 10° in the outer circumferential direction, the sealing between the charging hole of the coke oven and the charging hole cover is improved.

[0028] Although the present embodiment has been described in detail as above, it will be easily understood by those skilled in the art that many modifications are possible without substantially departing from the novel matters and effects of the present disclosure. Therefore, all such modifications are included in the scope of the present disclosure. For example, a term described at least once in the specification or drawings together with a different term having a broader meaning or the same meaning can be replaced with that different term anywhere in the specification. In addition, the configuration of the present embodiment is not limited to that described in the present embodiment, and various modifications are possible. [Explanation of symbols]

[0029] 10 Coke oven charging hole cover, 11 iron shell, 12 refractory material

Claims

1. A cover to be inserted into a charging hole of a coke oven, The furnace comprises an iron shell and a refractory material, The shell has an upper surface portion and a cylindrical portion, The refractory body has an upper portion and a lower portion, the upper surface portion of the shell covers an upper surface of the upper portion of the refractory material, The cylindrical portion of the shell covers a side surface of the upper portion of the refractory material, The lower part of the refractory material to be fitted into the charging hole of the coke oven has a tapered structure tapered downward, and an outer peripheral surface of the lower part of the refractory material is a tapered surface, a lower end of an outer peripheral surface and an inner peripheral surface of the tubular portion of the shell are chamfered, and the outer peripheral chamfered surface and the inner peripheral chamfered surface intersect to form a lower end apex edge; A coke oven loading hole cover, characterized in that the outer peripheral chamfered surface of the iron shell smoothly connects with the tapered surface of the refractory material.

2. The charging hole cover of the coke oven according to claim 1, A coke oven loading hole cover, characterized in that the angle between the inner peripheral surface of the iron shell and the inner peripheral chamfered surface is 100 to 170 degrees.

3. The charging hole cover of the coke oven according to claim 1, A coke oven loading hole cover characterized in that, when the heights from the upper ends of the outer chamfered surface and the inner chamfered surface of the iron shell to the lower end top edge are h1 and h2, respectively, 1≦h1 / h2≦4.

4. The charging hole cover of the coke oven according to any one of claims 1 to 3, a gap between a lower end of the outer peripheral chamfered surface of the shell and an upper end of the tapered surface of the refractory material is 5 mm or less; A coke oven loading hole cover, characterized in that the angle between the tapered surface of the refractory material and the outer peripheral chamfered surface of the iron shell is within 20° in the inner circumferential direction and within 10° in the outer circumferential direction.

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