Refractory structure of coke oven

Abstract

To provide a refractory structure of a coke oven, capable of, in a refractory structure of a coke oven, shortening a distance from a top edge of a heat storage body to a ceiling of a top part of a ceiling part space.SOLUTION: Disclosed is a refractory structure of a coke oven having a carbonization chamber and a combustion chamber arranged in an upper stage and a heat storage chamber 1 arranged in a lower stage, wherein the refractory structure of the coke oven is characterized by that: the heat storage chamber 1 is sectioned by a pillar wall 7 between the neighboring other heat storage chamber in a length direction of a coke oven battery 32; a refractory constituting a ceiling part of the heat storage chamber 1 is constituted of a single refractory block (heat storage chamber ceiling part block 15) per the heat storage chamber 1 in the length direction of the coke oven battery 32; and both end parts 16 of the heat storage chamber ceiling part block 15 in the length direction of the coke oven battery 32 are supported by pillar walls 7 on both ends in the length direction of the coke oven battery 32 of the heat storage chamber 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a refractory structure of a coke oven, and more particularly to a refractory structure for a ceiling of a regenerator of a coke oven. [Background technology]

[0002] In a chamber-furnace coke oven, as shown in Figure 2(A), the coking chamber 2 and combustion chamber 3 are arranged on the upper level, and the regenerator chamber 1 is arranged on the lower level. The coking chambers 2 and combustion chambers 3 are arranged alternately in the furnace batter length direction 32. The section between the coking chamber 2 and the regenerator chamber 1 is called the bellows section 6. The regenerator chambers 1 are separated by pillar walls 7 as shown in Figure 2(B) as partitions between adjacent regenerator chambers 1a in the furnace batter length direction 32, and by partition walls 8 in the furnace length direction 31 as shown in Figure 2(A). Gitter bricks are stacked inside the regenerator chamber 1 as the regenerator body 5 (the dotted hatched area in Figure 2(B)). A solflubricant 4 is arranged at the bottom of the regenerator chamber 1. The regenerator chamber 1 and the combustion chamber 3 are connected by a gas flow path 9. Typically, the dimensions of a coking chamber are approximately 4 to 7.5 m in height, 350 to 550 mm in width, and 13 to 17 m in length. The partitions between the coking chamber and combustion chamber, the partitions between the combustion chamber flues, the furnace top, the bellows, the regenerator, and the sole flue are all made of refractory brickwork.

[0003] As shown in Figure 2(B), the top of the regenerator 1 has a tapered shape with pillar wall tops 13 (the inverted trapezoidal parts surrounded by the two-dot chain line in Figure 2(B)) protruding from both sides in the furnace battery length direction 32, forming a ceiling space 12 that extends to the ceiling 11 (see Patent Document 1). The boundary between the ceiling space 12 and the pillar wall tops 13 is referred to here as the ceiling contour 14. For example, in a regenerator with a width of 900 mm in the furnace battery length direction, the distance from the ceiling 11 to the top end of the regenerator 5 (the height of the ceiling space 12) was approximately 490 mm.

[0004] The refractory structure of coke ovens has traditionally been formed by stacking hand-laid bricks on-site. Because the process of laying silica bricks using this hand-laid method is entirely done by hand, shortening the construction time requires the work of a large number of skilled bricklayers. However, because the number of skilled bricklayers is limited, it is difficult to secure a sufficient number of bricklayers to complete construction in a short period of time.

[0005] Instead of stacking hand-laid bricks on-site as described above, it is known to form the refractory structure of a coke oven by adding water to a granular refractory composition of a predetermined composition, kneading the mixture, pouring it into a mold, and drying it to form a large refractory block, which is also called a large precast refractory block, and then using it as the refractory structure of the coke oven.

[0006] Patent Document 2 discloses a method for constructing a chamber-hearth coke oven in which large precast refractory blocks are used for at least some of the refractories constituting the combustion chamber, regenerator, sole flue, bellows, and furnace top of the coke oven. This makes it possible to provide a chamber-hearth coke oven construction method and a refractory structure for a chamber-hearth coke oven that significantly reduces the number of skilled ovenbuilders required for brick construction of the coke oven.

[0007] Patent Document 3 discloses a method for constructing a coke oven, characterized in that at least the hearth, sole flue section, regenerator chamber, and bellows section, excluding the partition wall and gitter bricks in the regenerator chamber, are constructed on the coke oven foundation using refractory blocks, and then the partition wall and gitter bricks in the regenerator chamber are constructed.

[0008] According to Figure 1 of Patent Document 2 (a partial perspective view showing an example of a refractory structure of a coke oven), in the bellows section at the top of the regenerator chamber in the furnace batter length direction, a large precast bellows section block (16) is used at the top of the refractory (pillar wall top 13 in Figure 2(B) above) that separates the regenerator chamber, and the pillar wall tops protrude from both sides in the furnace batter length direction at the top of the regenerator chamber, forming a tapered shape and forming a ceiling space for the regenerator chamber similar to that shown in Figure 2(B) above. Also in Patent Document 3, Figure 6 of the same document shows a large precast block used in the bellows section, which has an inverted trapezoidal shape and forms a ceiling space for the regenerator chamber similar to that of Patent Document 1.

[0009] Patent Document 4 discloses a suitable component composition of a precast refractory block for a coke oven. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-163164 [Patent Document 2] Japanese Patent Application Publication No. 2019-112503 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-222758 [Patent Document 4] International Publication No. WO2017 / 146254 Summary of the Invention [Problem to be solved by the invention]

[0011] As described above, the conventional shape of the heat regenerator 1 in a coke oven is such that the pillar wall tops 13 protrude, as shown in Figure 2(B), and therefore the ceiling space 12 extending to the ceiling 11 is tapered upward. Since the heat storage body 5 cannot be placed in the tapered ceiling space 12, the ceiling space 12 does not function as a heat regenerator, as shown in Figure 2(B). Therefore, in the vertical arrangement of the coke oven, the ceiling space 12 (from the upper end of the heat storage body 5 to the ceiling 11 at the top of the ceiling space 12) is a height portion that is not effectively used.

[0012] The present invention aims to provide a refractory structure for a coke oven in which a carbonization chamber and a combustion chamber are arranged on the upper level and a heat regenerator is arranged on the lower level, which can shorten the distance from the upper end of the heat regenerator 5 to the ceiling 11 at the top of the ceiling space 12. [Means for solving the problem]

[0013] That is, the gist of the present invention is as follows. [1] A refractory structure of a coke oven in which a carbonization chamber and a combustion chamber are arranged in the upper stage and a heat regenerator is arranged in the lower stage, A refractory structure of a coke oven, characterized in that the heat storage chambers are separated from adjacent heat storage chambers by pillar walls in a direction perpendicular to the longitudinal and height directions of the carbonization chamber (hereinafter referred to as the ``furnace battery length direction''), and the refractory material constituting the ceiling of the heat storage chamber is composed of a single refractory block (hereinafter referred to as the ``heat storage chamber ceiling block'') for each heat storage chamber in the furnace battery length direction, and both ends of the heat storage chamber ceiling block in the furnace battery length direction are supported by the pillar walls at both ends of the heat storage chamber in the furnace battery length direction. [2] The refractory structure of a coke oven according to [1], characterized in that the surface of the heat regenerator ceiling block facing the heat regenerator is flat. [3] A refractory structure of a coke oven described in [1] or [2], characterized in that a heat storage body is formed by stacking gitter bricks inside the heat storage chamber, and the distance between the surface of the heat storage chamber ceiling block facing the heat storage chamber and the upper end of the heat storage body is 0.5 times or less the width of the surface facing the heat storage chamber in the furnace baffle length direction. [4] The refractory structure for a coke oven according to any one of [1] to [3], wherein the width of the regenerator in the furnace battery length direction is 600 mm or more. [Effects of the Invention]

[0014] The present invention relates to a refractory structure for a coke oven in which a carbonization chamber and a combustion chamber are arranged on the upper level and a heat regenerator is arranged on the lower level.The refractory that forms the ceiling of the heat regenerator is constructed of a single refractory block (heat regenerator ceiling block) for each heat regenerator in the furnace brigade length direction, thereby shortening the distance from the upper end of the heat regenerator to the ceiling at the top of the ceiling space. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view of a regenerator portion showing an example of a refractory structure of a coke oven according to the present invention. [Figure 2] 1A and 1B are diagrams showing the refractory structure of a conventional coke oven, in which (A) is a cross-sectional view of the coke oven as seen from the direction of the furnace battery length, and (B) is a partial cross-sectional view as seen in the direction of the arrow BB. DETAILED DESCRIPTION OF THE INVENTION

[0016] In recent large coke ovens, the width of the regenerator in the furnace batter direction is approximately 600 to 1,000 mm. When the refractory structure of a coke oven is constructed using hand-laid bricks, each brick weighs approximately 20 kg, and the size of the bricks used near the top of the regenerator is approximately 300 mm wide and 375 mm long. In particular, for a regenerator with a width of 600 mm or more in the furnace batter direction, if a ceiling structure for the regenerator is constructed using hand-laid bricks with a length of approximately 375 mm in the furnace batter direction, it is necessary to stack the hand-laid bricks so that the pillar wall tops 13 protrude, as shown in Figure 2(B), in order to concentrate the weight of the upper part on the pillar wall and to construct a structure that supports the tapered ceiling space 12. It has become clear that the above-mentioned reason is the reason why a tapered shape as shown in Fig. 2(B) has been adopted for the ceiling space 12 of a conventional heat storage chamber. On the other hand, even when large precast blocks are used near the top of the pillar wall instead of stacked hand-laid bricks, blocks with a protruding pillar wall top 13 have been used (see Patent Documents 2 and 3).

[0017] The inventors came up with the idea that if the refractory material constituting the ceiling of the heat storage chamber is constructed of a single refractory block (heat storage chamber ceiling block 15) for each heat storage chamber 1 in the furnace batter length direction 32, as shown in Figure 1, and both ends 16 of the heat storage chamber ceiling block 15 in the furnace batter length direction 32 are supported by pillar walls 7 at both ends of the heat storage chamber 1 in the furnace batter length direction, then even if the ceiling of the heat storage chamber is flat, it will be able to withstand the load of the structure above the heat storage chamber.

[0018] In Figure 1, the hatched areas represent the refractory structure, and the dotted areas represent the regenerator 5. In the hatched areas, each figure (mainly a rectangle) surrounded by thin lines represents a single refractory block. In the example shown in Figure 1, the refractory structure, from the sole flue 4 to the regenerator 1 and the bellows 6, is composed entirely of large refractory blocks, including the regenerator ceiling block 15 located on the ceiling of the regenerator 1. Between the regenerator 1 and the adjacent regenerator 1a in the furnace battery length direction 32, a pillar wall 7 is located, and the pillar wall 7 is also composed of a large refractory block. The regenerator ceiling block 15 is composed of a single refractory block for each regenerator, and both ends 16 in the furnace battery length direction 32 are supported by the upper ends 17 of the pillar wall 7.

[0019] 1 structure, it has been found that the rigidity of the refractory structure can be ensured even when the ceiling 11 of the heat regenerator 1 is flat, even if the width in the furnace battery direction 32 is 600 mm or more. As a result, for example, in a heat regenerator chamber with a width of 930 mm in the furnace battery direction 32, it is possible to reduce the distance from the ceiling 11 to the top end of the heat storage body 5 to the minimum distance (300 mm) that ensures the function of the heat regenerator, thereby narrowing the ceiling space 12.

[0020] The lower surface of the heat storage chamber ceiling block 15 is most preferably flat, but may also be curved, such as having an upward concave shape.

[0021] By using the refractory structure described above, the present invention allows gitter bricks to be stacked inside the heat storage chamber 1 to form the heat storage body 5, and the distance between the surface (ceiling 11) of the heat storage chamber ceiling block 15 facing the heat storage chamber 1 and the upper end of the heat storage body 5 can be made 0.5 times or less the width in the furnace batter length direction of the surface facing the heat storage chamber (the width in the furnace batter length direction of the part of the heat storage chamber 1 that accommodates the heat storage body 5).

[0022] As a result of being able to shorten the distance between the surface of the heat storage chamber ceiling block 15 facing the heat storage chamber 1 and the upper end of the heat storage body 5, the volume of the ceiling space 12 can be reduced, the unused volume portion of the total volume of the heat storage chamber 1 can be reduced, and the effective utilization efficiency of the coke oven in the vertical direction can be increased.

[0023] In the example shown in Fig. 1, the entire refractory structure is made of large refractory blocks, not only the regenerator ceiling block 15 but also the soleflues 4, the regenerator 1, and the bellows section 6. However, it is also possible to use a large refractory block for at least the regenerator ceiling block 15, and to construct all or part of the other refractory structures using hand-laid bricks.

[0024] The regenerator ceiling block 15 can be formed as a refractory block obtained by integrally molding a monolithic refractory. Specifically, the block can be formed by adding water to monolithic refractory (powdered refractory) as a raw material, kneading the mixture, pouring the mixture into a mold, and drying the mixture.

[0025] Large precast refractory blocks, including the regenerator ceiling block 15, require high hot strength and stable expansion behavior under load at high temperatures. To achieve this quality, the following raw material composition is preferred. Specifically, as described in Patent Document 4, the SiO2 content as the main component is approximately 65% ​​by mass to 99% by mass, and the P2O5 content is 0.3% by mass to 2% by mass. As SiO2 component sources, the blending amount of fused silica is preferably 65% ​​by mass or more, the blending amount of silica stone is 17% by mass or less, and the blending amount of fumed silica is preferably 0.5% by mass to 15% by mass. By using a blending amount of fused silica of 65% by mass or more, shrinkage due to dehydration during drying can be counteracted. The P2O5 component functions as a binder component. By using the P2O5 component as a binder component, high hot strength can be maintained while stable expansion / contraction behavior under load at high temperatures can be controlled. The amount of the alkaline earth metal compound is preferably 0.05% by mass or more and 1.9% by mass or less. The siliceous raw material and phosphate are blended as the raw material blend, and organic fibers, dispersants, hardening accelerators, hardening retarders, sintering aids, etc. are also blended as needed. An appropriate amount of construction water is added to the resulting raw material blend, followed by kneading, molding, curing, and demolding, to obtain a large precast refractory block by a conventional manufacturing method.

[0026] Regarding the shape of the heat storage chamber ceiling block 15, the length in the furnace batter length direction 32 must be such that, in addition to the width of the heat storage chamber 1 in the furnace batter length direction 32, both ends 16 of the heat storage chamber ceiling block 15 are supported by the pillar wall top 13. As shown in Fig. 1, in the bellows portion 6 at the top of the heat storage chamber 1, the gas flow path 9 is inverted at a gas flow path inflection position height 18. The height in the height direction 33 of the heat storage chamber ceiling block 15 is preferably set to the range up to the path of the gas flow path 9 in one direction, that is, from the ceiling 11 of the heat storage chamber 1 to the gas flow path inflection position height 18 (see 15b in Fig. 1). As shown in 15a in Fig. 1, the height may also be set to a position lower than the gas flow path inflection position height 18. The width in the furnace length direction 31 is not particularly limited, but it is preferable to construct it between the partition walls 8, as this will result in the same shape. It is preferable if it can be expanded to two spans of the partition walls 8 or more. [Explanation of symbols]

[0027] 1 Heat storage chamber 2. Carbonization chamber 3 Combustion chamber 4 Soulfulyu 5 Heat storage body 6 Bellows 7 Pillar Wall 8 Partition Wall 9 Gas flow path 11 Ceiling 12 Ceiling space 13 Pillar wall top 14 Ceiling contour 15 Heat storage chamber ceiling block 16 End 17 Upper end 18 Gas path inflection position height 31 Furnace length direction 32 Furnace leader direction 33 Height

Claims

1. A refractory structure of a coke oven in which a carbonization chamber and a combustion chamber are arranged in an upper stage and a heat regenerator is arranged in a lower stage, The heat regenerator chambers are separated from adjacent heat regenerator chambers by pillar walls in a direction perpendicular to the longitudinal direction and height direction of the carbonization chamber (hereinafter referred to as the "furnace battery length direction"), and the refractory material constituting the ceiling of the heat regenerator chamber is constituted by a single refractory block (hereinafter referred to as the "heat regenerator ceiling block") for each heat regenerator in the furnace battery length direction, The surface of the heat storage chamber ceiling block facing the heat storage chamber is flat, Both end portions of the heat storage chamber ceiling block in the furnace battery length direction are supported by the pillar walls at both ends of the heat storage chamber in the furnace battery length direction, A refractory structure for a coke oven, characterized in that a heat storage body is formed by stacking gitter bricks inside the heat storage chamber, and the distance between the surface of the heat storage chamber ceiling block facing the heat storage chamber and the upper end of the heat storage body is 0.5 times or less the width of the surface facing the heat storage chamber in the furnace batter length direction.

2. 2. A refractory structure for a coke oven according to claim 1, wherein the width of the regenerator in the furnace battery length direction is 600 mm or more.

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