JP2017014346A - Refractory block for coke oven combustion chamber, and refractory block masonry structure of coke oven combustion chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refractory block 11 for coke oven combustion chamber capable of enlarging a refractory for repair of a coke oven combustion chamber 2, needing no removal of metallic materials such as a backstay when repairing, and capable of improving the application efficiency of a furnace construction.SOLUTION: In a refractory block 11 comprising a nonburned refractory, a binder wall 12 of a combustion chamber flue 3 and a laufer wall are formed integrally in an L shape. Two refractory blocks (11a, 11b) arranged in a longitudinal direction 32 of a coke oven battery form one pair, and the combustion chamber flues of n pieces are formed by disposing n-set refractory block pairs in an oven length direction 31. A repair work is completed by setting a few refractories since the nonburned refractory-made refractory block can be enlarged and thus, a repair efficiency can be elevated. Thereby, it is possible to repair without removing the backstays since the refractory block 11 can pass through a space between the backstays even if being a large-sized one.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a refractory block and a refractory block stack structure that form a combustion chamber flue of a coke oven combustion chamber.

  In a chamber-type coke oven, carbonization chambers and combustion chambers are alternately arranged in the furnace group length direction, and the combustion chambers are composed of combustion chamber flue rows arranged in the furnace length direction. The partition walls between the carbonization chamber and the combustion chamber and the partition walls between the combustion chamber flues are both formed in a brick structure. As shown in FIG. 4, the partition wall portion that separates the carbonization chamber 1 and the combustion chamber flue 3 is referred to as a Royfer wall 5, and the partition wall portion that separates adjacent combustion chamber flues 3 is referred to as a binder wall 4. Usually, the dimensions of the carbonization chamber are about 4 to 7.5 m in furnace height, 350 to 550 mm in furnace width, and 13 to 17 m in furnace length.

  The refractory used in the chamber furnace coke oven has high mechanical strength in the high temperature range, little volume change, relatively good thermal conductivity, and the reason that the material is inexpensive and available in large quantities. Therefore, most of them are constructed of quartz brick. The temperature during operation of the chamber-type coke oven is about 1100 to 1300 ° C in the highest combustion chamber by burning the coke oven gas, blast furnace gas alone or mixed gas as fuel gas, and the coal in the carbonization chamber It is about 1000 ° C. on the heat transfer surface.

  FIG. 4 shows a typical brick structure of a furnace wall. It consists of three types of bricks: a T-shaped hammer brick 41 straddling a part of the Royfer wall 5 and a part of the Binder wall 4, a Royfer brick 42 located on the Royfer wall 5, and a Binder brick 43 located on the Binder wall 4. ing. These bricks are composed of silica bricks as described above. It is a fired brick manufactured by firing raw material quartzite, the height is 100 to 150 mm, the length and width are determined from the shape of the combustion chamber flue, and the mass per piece is less than 20 kg. The joint surface between the bricks and the bricks is referred to as a joint 44, and each joint has an uneven fitting portion 21 as shown in FIG. 4, and has a function of increasing the brick-stacking structure strength and improving the sealing property.

  Back stays are arranged vertically at both ends of the combustion chamber in the furnace length direction, cross tie rods are passed through the top and bottom of the opposing back stay, tightened with a predetermined load from both ends by a tightening mechanism such as a spring, and the back stay The furnace brick is tightened. A protective plate is disposed between the brick at the end of the combustion chamber in the furnace length direction and the backstay.

  The furnace length direction end of the carbonization chamber constitutes a kiln and is closed by a furnace lid. When the carbonization of the coal charged in the carbonization chamber is completed and coke is completed, the furnace lid is removed, the kiln is opened, the extruder is loaded from one (pusher side) kiln, and the other (coke side). Extrude coke out of the kiln.

  The bricks that make up the furnace length direction ends of the carbonization chamber and the combustion chamber decrease in temperature each time the furnace cover is opened, and the bricks are easily damaged, and when damage progresses, repairs are carried out by transshipment. Yes. In addition, the hardware of the kiln such as a backstay and a protection plate may be updated at the time of transshipment. Patent Document 1 discloses a protective plate replacement method that can safely perform hot replacement of a protective plate of a coke oven kiln in an actual furnace without causing collapse of the kiln brick or the protective plate. . In Patent Document 2, the carbonization chamber ceiling brick is held horizontally and bricks are stacked, and the carbonization chamber furnace wall of the chamber-type coke oven can be held horizontally even after the temperature rises. A brick transshipment method for a coke oven carbonization chamber to be repaired is disclosed.

  Patent Document 3 discloses a brick for coke oven furnace interior lining. It consists of two types of T-shaped bricks, and the horizontal bars of T form part of the Royfer wall of the adjacent combustion flue, and the vertical bars form part of the binder wall. The two types are different in the length of the horizontal bar of T, and the long horizontal bar has a concave-convex fitting portion on the upper and lower surfaces near the tip of the horizontal bar and directed in the length direction of the furnace group. Further, the two types have different lengths of the vertical bars of T, and those having a long vertical bar have a concave-convex fitting portion directed in the furnace length direction on the upper and lower surfaces near the tip of the vertical bar. By arranging two types of shaped bricks in a staggered manner in the coke oven height direction, the bricks with long T horizontal bars are constrained by the uneven fitting part between adjacent combustion chamber flues, and the vertical length of T in the furnace group length direction Bricks with long bars are restrained by the concave-convex fitting portion to ensure the moldability of the combustion chamber.

  In Patent Document 4, L-shaped Royfer A brick, I-shaped Royfer B brick and Binder brick are used, and two Royfer A bricks, 2 Royfer B bricks, and 2 Binder bricks are used for combustion. A brickwork structure that forms a chamber flue is disclosed.

  As described above, coke after dry distillation is pushed out of the coke side by the extruder charged from the pusher side. In order to smoothly extrude the coke, the width of the coking chamber in the length direction of the furnace group is gradually increased from the pusher side toward the coke side. Therefore, the width of the combustion chamber is gradually reduced from the pusher side toward the coke side. In the conventional brick structure combining hammer brick, binder brick, and Royfer brick, the width of the combustion chamber is changed in the furnace length direction by changing the size of the binder brick according to the kiln width of the carbonization chamber at each flue position. It was gradually changed.

JP-A-4-366198 JP 2012-236896 A JP 9-506909 A JP 2008-127472 A

  As described above, since the bricks constituting the ends of the carbonization chamber and the combustion chamber in the furnace length direction are more severely damaged than other portions, it is necessary to replace the bricks damaged by the hot repair. If it is necessary to replace the backstay and protection plate at the same position at the same time as replacing the brick in the specified combustion chamber, first remove the backstay and protection plate, and then replace the brick in an open place. Can do. On the other hand, when there is no need to replace the back stay and the protection plate, only the brick is replaced without removing the back stay and the protection plate. Conventionally, after removing damaged bricks, repair was performed using the same brick shape bricks used for building the bricks of the combustion chamber as repair bricks. Ordinary silica bricks are fired bricks that are small in size and therefore have a large number of bricks to be replaced. Therefore, the number of times of taking-in increases, so the construction efficiency of the furnace construction is not good. Although it is conceivable to increase the size of the repair brick, the construction efficiency of the furnace construction will deteriorate rather than the need to remove the backstay during repair.

  The present invention provides a refractory block for a coke oven combustion chamber that can increase the size of the refractory for repairing the combustion chamber, eliminates the need to remove hardware such as a backstay during repair, and can improve the construction efficiency of the furnace construction. The purpose is to provide.

  In addition, the present invention provides a refractory block for a coke oven combustion chamber and a coke oven combustion chamber in which the furnace length direction width of the combustion chamber can be sequentially changed without increasing the number of types of blocks and without requiring block cutting processing. A second object is to provide a refractory block stacking structure.

That is, the gist of the present invention is as follows.
(1) Coking chambers and combustion chambers are alternately arranged in the furnace group length direction, and the combustion chambers are refractory blocks used in a coke oven comprising combustion chamber flue rows arranged in the furnace length direction, and adjacent combustion chamber flues. The partition wall is called the binder wall, and the partition wall between the combustion chamber flue and the carbonization chamber is called the Royfer wall,
The refractory block consists of a bunker wall and a leufer wall of the combustion chamber flue formed in an L shape, and when arranged in the length direction of the furnace group, two refractory blocks form one refractory block pair. , N combustion chamber flues are formed by arranging n refractory block pairs in the furnace length direction,
A refractory block for a coke oven combustion chamber, wherein the refractory block is made of a non-fired refractory. However, n is an integer of 1 or more.
(2) The end face of the refractory block that faces the refractory block that is adjacent to the refractory block in the horizontal direction has a step where one end of the furnace length direction and the other end are different in position in the furnace group length direction. The refractory block for a coke oven combustion chamber according to the above (1), characterized by comprising:
(3) Coke oven height direction height is 200 mm or more and 500 mm or less, The refractory block for coke oven combustion chambers as described in said (1) or (2) characterized by the above-mentioned.
(4) The coke oven height direction end face has a convex dowel on one end face and an uneven fitting portion having a concave groove on the other end face (1) The refractory block for coke oven combustion chambers as described in any one of thru | or (3).
(5) The refractory block for a coke oven combustion chamber according to any one of (1) to (4) above, wherein 90 mass% or more of fused silica is contained as an aggregate of the irregular refractory.
(6) The refractory block for a coke oven combustion chamber according to any one of (1) to (5) above is used as one refractory block pair, and n sets of refractory block pairs are L-shaped. A refractory block stacking structure for a coke oven combustion chamber, wherein n combustion chamber flues are formed by arranging them in the same direction in the furnace length direction. However, n is an integer of 1 or more.

  While the refractory block for the coke oven combustion chamber of the present invention is enlarged to correspond to one combustion chamber flue with two refractory blocks, it is not necessary to remove hardware such as a backstay during repair, The construction efficiency of the furnace construction can be improved.

It is a top view which shows the combustion chamber using the refractory block of this invention. It is a figure which shows the refractory block of this invention, (a) (b) is a top view, (c) is CC sectional view taken on the line. It is a figure which shows the repair condition by the refractory block of this invention. It is a top view which shows the combustion chamber using the conventional brick.

  A refractory block for a coke oven combustion chamber according to the present invention will be described with reference to FIGS.

  In the refractory block 11, the binder wall portion 12 and the leufer wall portion 13 of the combustion chamber flue 3 are integrally formed in an L shape. Looking at one combustion chamber flue 3A shown at the left end of FIG. 1, one bender wall 4A has two binder walls (12a, 12b) of two refractory blocks (11aA, 11bA) arranged in the furnace group length direction 32. ) In combination. One combustion chamber flue 3A has one royer wall 5a constituted by one refractory block 11aA and the other royer wall 5b constituted by another refractory block 11bA. Therefore, two refractory blocks (11aA, 11bA) arranged in the furnace group length direction 32 form one set (refractory block pair 10A). By arranging two refractory block pairs (10A, 10B) in the furnace length direction 31, for one of the two combustion chamber flues (3A), both the binder walls (4A, 4B) in the furnace length direction Is formed. Therefore, n combustion chamber flues 3 are formed by arranging n refractory block pairs 10 in the furnace length direction 31.

  When using a T-shaped molded brick as described in Patent Document 3, the leufer wall of one combustion chamber flue is formed by joining two T-shaped horizontal bar ends to each other. Is disposed on the surface of the combustion chamber flue, so there is a concern about medium- and long-term gas leaks. On the other hand, the refractory block 11 of the present invention is preferably joined to the adjacent refractory block 11 at the end of the Royfer wall 5, which can reduce the risk of gas leakage.

  About the coke oven height direction 33 height h (refer FIG.2 (c)) of the refractory block 11, what is necessary is just the range which can pass through the space between the installed backstays 6. FIG. As a result, when the refractory block 11 is carried into the repair site, the height direction 33 height of the refractory block 11 is increased if the binder wall portion 12, which is the furnace group length direction 32 of the refractory block 11, is oriented vertically. Since the length h is within a range that can pass between the back stays 6 (see the refractory block 11 indicated by a solid line in FIG. 3), it can be passed through the back stays 6 and carried to the repaired location. After carrying in, the refractory block 11 is rotated around the furnace length direction 31 axis so that the binder wall 12 faces the furnace group length direction 32 and is installed at the repair location (the refractory shown by the one-dot chain line in FIG. 3). (See block 11).

  The refractory block 11 is made of an unfired refractory. Since it is not fired, it is possible to increase the size, unlike fired brick. Preferably, the powder can be formed by adding a little water to the amorphous refractory and the binder, kneading, pouring into a frame having the shape of the refractory block 11, drying and solidifying, and removing from the mold. .

  Based on FIG. 3, the coke oven combustion chamber repairing method using the refractory block 11 of the present invention will be described. In the example shown in FIG. 3, the refractories of the two combustion chamber flues (3A, 3B) in the two adjacent combustion chambers 2 are exchanged from the furnace end side.

  A curing wall 36 is installed between the combustion chamber flue 3B in the second row and the combustion chamber flue 3C in the third row from the furnace end side. The curing wall 36 is maintained at a temperature higher than that of the curing wall 36 at a high temperature during normal operation. The temperature at the furnace end side is lowered to a temperature at which repair work can be performed after the scaffold 37 is installed. In both of the two combustion chambers 2 to be repaired, the backstay 6 and the protective plate 7 are left without being removed.

  Next, the refractories in the two combustion chambers 2 to be replaced are removed. The brick of the binder wall 4C that separates the combustion chamber flue 3B in the second row and the combustion chamber flue 3C in the third row remains.

  The refractory blocks 11 of the present invention are arranged one by one, the furnace length direction 31 of the refractory block 11 is directed to the furnace length direction 31 of the furnace, the height h direction of the refractory block 11 is directed to the furnace length direction 33, and adjacent to each other. Pass through the space between the matching backstays 6 and carry it into the furnace (refractory block 11 shown by solid lines). Next, the refractory block 11 is rotated around the furnace length direction 31 axis so that the bender wall 12 portion faces the furnace group length direction 32 and is installed at the repair location (the refractory block 11 indicated by a one-dot chain line). . If the number of combustion chamber flues 3 to be repaired is two per combustion chamber, the repair is completed by installing four refractory blocks 11 per step in the height direction of the refractory block. If the height h 33 of the coke oven height direction of the refractory block 11 is, for example, three times the height 33 height direction of the fired brick used normally, the four refractory blocks 11 are installed, so that the combustion chamber flue The repair for two bricks and three steps of bricks will be completed.

  When three bricks of two adjacent combustion chamber flues are stacked using conventional bricks, a total of 8 × 3 tiers = 24 when using hammer bricks, royfer bricks, and binder bricks as shown in FIG. Individual bricks are required. Similarly, when the Royfer A brick, the Royfer B brick and the Binder brick described in Patent Document 4 are used, a total of 8 bricks × 3 stages = 24 bricks are required. On the other hand, as described above, by using the refractory block of the present invention, it is sufficient to use four refractory blocks of the present invention to repair two combustion chamber flues and three steps of bricks. Become.

  As described above, the joint 44, which is the mating surface of the refractory and the refractory, is usually formed with the concave and convex fitting portion 21, thereby increasing the strength of the brickwork structure and improving the sealing performance. On the other hand, preferably in the present invention, as shown in FIGS. 2 (a) and 2 (b), the end surface 14 of the refractory block 11 which is in contact with the refractory block 11 which is adjacent to the horizontal side in the horizontal direction is a furnace. One end portion 16 a in the long direction and the other end portion 16 b have a step 15 having a different position in the furnace group length direction 32. The step 15 portion may be a step 15 having a right-angled bent portion as shown in FIG. 2 (a), or may be a step 15 having an inclined portion as shown in FIG. 2 (b). When the two refractory blocks (11a, 11b) are installed in the furnace group length direction 32 to form the binder wall 4, the joint 44, which is a mating surface of the two refractory blocks, is joined via the mortar layer 17. . The difference d in the position in the furnace group length direction 32 at the step 15 is preferably 50 mm or more.

  As described above, the width of the combustion chamber 2 in the furnace group length direction decreases in the furnace length direction 31 from the pusher side 34 toward the coke side 35. In forming the combustion chamber 2 using the refractory block 11 of the present invention, by changing the thickness of the joint mortar layer 17 of the mating surfaces of the two refractory blocks (11a, 11b) for each combustion chamber flue 3, By changing the width of the combustion chamber 2, the width can be narrowed from the pusher side 34 toward the coke side 35 in the furnace length direction 31. The example shown in FIG. 1 emphasizes the situation in which the joint mortar layer 17 thickness of the mating surfaces of the two refractory blocks (11a, 11b) is sequentially reduced from the combustion chamber flue 3A to the combustion chamber flue 3C. It shows. Since such a construction method can be adopted, it is not necessary to prepare a large number of types having various dimensions in the furnace length direction as the refractory block, and it is sufficient to prepare a small number of types.

  In addition, when using the shaping | molding brick of patent document 3, since predetermined | prescribed combustion chamber width | variety is implement | achieved by cutting the edge part of shaping | molding brick and the width | variety of a combustion chamber is changed, time will be required for cutting. The refractory block of the present invention is preferable because the width of the combustion chamber can be changed only by adjusting the joint width without cutting the refractory.

  In the refractory block 11 of the present invention, the height h in the coke oven height direction 33 is preferably 200 mm or more and 500 mm or less. As the height direction 33 height h of the refractory block 11 is higher, the number of stages to be piled up during repair can be reduced, so that the construction efficiency of the furnace construction can be increased. If the height h is 375 mm or more, three steps of bricks that are usually used can be built at one time, which is preferable. On the other hand, if the height h is 480 mm or less, it is preferable because it can pass through the space between the backstays 6 installed at the time of repair.

  On the other hand, as shown in FIG. 2 (c), the coke oven height direction end face 18 has a concave-convex fitting portion 21 having a convex dowel 22 on one end face and a concave groove 23 on the other end face. Preferably formed. Thereby, generation | occurrence | production of the shift | offset | difference between the refractory blocks 11 assembled up and down can be prevented.

  The refractory block 11 of the present invention is preferably made of fused silica as the main component. Fused silica is amorphous and hardly thermally expands from room temperature to 1000 ° C. Therefore, by using fused silica as the main component, it is possible to increase the temperature increase rate after completion of repair. In the conventional repair method using silica brick, since the coefficient of thermal expansion of silica brick is high from room temperature to 600 ° C, it is necessary to slow the temperature increase rate after repair and complete the temperature increase over 5 to 8 days. was there. On the other hand, if it is the refractory block of this invention which has a fused silica as a main component, a temperature rising period will become unnecessary and temperature rising can be completed in 0 days. It contains 90% or more of fused silica as an aggregate of amorphous refractory, and the remainder is poured into a frame having the shape of refractory block 11 as an alumina, calcia, or cement binder, dried and solidified, and then removed from the mold It can be formed by removing.

  The repair range of the combustion chamber refractory is determined visually before the repair is started, and the refractory block 11 necessary for repair is prepared and started. However, after the existing refractory bricks are dismantled for repair, damaged parts may be found and the repair range expanded. If it is a refractory block of the present invention, there is no need to change the block shape, and by adjusting the joint thickness between the blocks 44, the same block can be used repeatedly, and it is possible to cope with the width of the kiln. It has a versatile shape that can be adapted to the situation.

  As the refractory block of the present invention, it is sufficient to prepare a few types of block shapes, so that the cost of manufacturing the block can be reduced, and the number of spare parts can be reduced, so that the cost can be cut down. .

  In the refractory block stacking structure of the coke oven combustion chamber of the present invention, the refractory block 11 for the coke oven combustion chamber of the present invention is used as one refractory block pair 10 and n sets of refractory block pairs 10 are combined. It is characterized in that n combustion chamber flues 3 are formed by arranging L-shapes in the same direction in the furnace length direction.

DESCRIPTION OF SYMBOLS 1 Carbonization chamber 2 Combustion chamber 3 Combustion chamber flue 4 Binder wall 5 Royfer wall 6 Backstay 7 Protection board 10 Refractory block pair 11 Refractory block 12 Binder wall part 13 Royfer wall part 14 Binder wall end surface 15 Step 16a One end part 16b Other end portion 17 Mortar layer 18 Height direction end surface 21 Concavity and convexity fitting portion 22 Dowel 23 Groove 31 Furnace length direction 32 Furnace length direction 33 Height direction 34 Pusher side 35 Coke side 36 Curing wall 37 Scaffold 41 Hammer brick 42 Royfer Brick 43 Binder brick 44 Joint

Claims (6)

The carbonization chamber and the combustion chamber are alternately arranged in the furnace group length direction, and the combustion chamber is a refractory block used in a coke oven composed of combustion chamber flue rows arranged in the furnace length direction, and a partition wall between adjacent combustion chamber flues Is called the Binder wall, the partition wall of the combustion chamber flue and the carbonization chamber is called the Royfer wall,
The refractory block consists of a bunker wall and a leufer wall of the combustion chamber flue formed in an L shape, and when arranged in the length direction of the furnace group, two refractory blocks form one refractory block pair. , N combustion chamber flues are formed by arranging n refractory block pairs in the furnace length direction,
A refractory block for a coke oven combustion chamber, wherein the refractory block is made of a non-fired refractory.
However, n is an integer of 1 or more.   The end face of the refractory block that faces the refractory block that is adjacent to the refractory block in the horizontal direction has a level difference between one end and the other end in the furnace length direction. The refractory block for a coke oven combustion chamber according to claim 1.   The height of the coke oven height direction is 200 mm or more and 500 mm or less, The refractory block for coke oven combustion chambers of Claim 1 or 2 characterized by the above-mentioned.   The coke oven height direction end face has a convex dowel on one end face and an uneven fitting portion having a concave groove on the other end face. A refractory block for a coke oven combustion chamber according to claim 1.   The refractory block for a coke oven combustion chamber according to any one of claims 1 to 4, comprising 90 mass% or more of fused silica as an aggregate of the irregular refractory. The refractory block for a coke oven combustion chamber according to any one of claims 1 to 5 is made into a set of two refractory block pairs, and the n sets of refractory block pairs are in the same direction in the furnace length direction. A refractory block stacking structure for a coke oven combustion chamber, wherein n combustion chamber flues are formed by arranging them so as to face each other.
However, n is an integer of 1 or more.

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